CN103973298A - Oscillation starting circuit - Google Patents
Oscillation starting circuit Download PDFInfo
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- CN103973298A CN103973298A CN201310032129.6A CN201310032129A CN103973298A CN 103973298 A CN103973298 A CN 103973298A CN 201310032129 A CN201310032129 A CN 201310032129A CN 103973298 A CN103973298 A CN 103973298A
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Abstract
The invention discloses an oscillation starting circuit which is used in an oscillator. The oscillation starting circuit comprises an oscillation starting device and an oscillation signal detector. The oscillation signal detector receives an output signal output by the oscillator, and outputs an enabled starting signal when it is detected that the level of the output signal is virtually fixed. The oscillation starting device generates and sends a first input signal and a second input signal which are opposite in polarity to the first input end and the second input end of the oscillator respectively when the starting signal is enabled. In this way, by means of the oscillation starting circuit, generation of oscillations of the oscillator can be guaranteed, and the oscillating time is shortened.
Description
Technical field
The present invention relates to a kind of vibration initialization circuit, particularly relate to a kind of vibration initialization circuit of guaranteeing that oscillator vibration produces.
Background technology
The maximum difference of oscillator and other circuit, is exactly that it only has output signal, but there is no input signal.Oscillator can produce output signal without input signal in the situation that, but must provide energy by the external world, makes oscillator maintain vibration.Method is by the inner amplifier of placing of oscillator, and the required energy of amplifier is from external DC power supply.
As shown in Figure 1, it is the circuit diagram of existing oscillator 1.Because oscillator must be a loop, and its principle is based on positive feedback, and noise (noise) is repeatedly amplified and reaches required vibration.Noise N1, N2 input via first input end 11, second input 12 of oscillator, after output 13,14 outputs, feed back to first input end 11, the second input 12.But oscillator 1 is the easy failed problem of vibrating that produces because the noise N1, the N2 that inject are too little often.Moreover, also have to produce vibration the long problem of duration of oscillation of setting up by injecting noise N1, N2 to oscillator.
Accordingly, how to provide a kind of vibration initialization circuit, guarantee the generation of oscillator vibration, and reduce the time that oscillator vibration is set up, become current industry problem demanding prompt solution.
Summary of the invention
In view of above-mentioned, the embodiment of the present invention proposes a kind of vibration initialization circuit, for oscillator, comprises vibration initiator and oscillator signal detector.
Oscillator signal detector, the output signal of reception oscillator output, if detect, the position standard of output signal is fixing in fact, the initial signal of output enable.
Vibration initiator, when initial signal is enabled, produces the first input signal of opposite polarity and the second input signal first input end and the second input to oscillator.
Accordingly, can guarantee that by vibration initialization circuit of the present invention the signal that inputs to oscillator first input end and the second input has opposite polarity so that oscillator produces vibration, and can reduce oscillator and set up the time of vibrating.In addition the measuring ability that, vibration initialization circuit has can be avoided after vibration foundation, oscillator being produced and being disturbed.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing oscillator;
Fig. 2 is the vibrate schematic diagram of initialization circuit of the present invention; And
Fig. 3 is the vibrate circuit diagram of initialization circuit of the present invention.
Embodiment
The ordinal number term using in the claims, for example " first ", " second " etc. are revised claim element, itself do not represent priority any between a claim element, precedence or order, or the time sequencing when step of manner of execution, but only distinguish as indicating the element (but for this ordinal number term) that there is the claim element of certain title and another and have same names, to distinguish this claim element.
Fig. 2 is according to the schematic diagram of the vibration initialization circuit 2 of one embodiment of the invention.Vibration initialization circuit 2, for oscillator 1, comprises vibration initiator 21 and oscillator signal detector 22.The first output signal O1 that the output 13 of oscillator signal detector 22 reception oscillators 1 or output 14 are exported or the second output signal O2, in this example to receive the second output signal O2 of output 14 as example.If oscillator signal detector 22 detects that the position standard of the second output signal O2 is fixing in fact, represent that oscillator 1 not yet vibrates, therefore the initial signal S of oscillator signal detector 22 output enables is to the initiator 21 that vibrates, 21 of initiators of vibration produce the first input signal IN1 of opposite polarities and the second input signal IN2 first input end 11 and the second input 12 to oscillator 1, make the oscillator 1 can starting oscillation; In the time that oscillator signal detector 22 detects that the first output signal O1 of oscillator 1 or the second output signal O2 have opposite polarity, represent that oscillator 1 successfully produces vibration, therefore the initial signal S that oscillator signal detector 22 is exported disabled is to the initiator 21 that vibrates, and 21 disconnections of vibration initiator are electrically connected with oscillator 11.
Vibration initialization circuit 2 also comprises the first initial output 211 and the second initial output 214.The first initial output 211 and the second initial output 214 are electrically connected vibration initiators 21, and are electrically connected respectively first input end 11 and second input 12 of oscillator 1.When vibration initiator 21 receives the initial signal S of activation, vibration initiator 21 receives the first input signal IN1 via the first initial output 211, and produce the second input signal IN2 of opposite polarity, input second input 12 of the second input signal IN2 to oscillator 1 via the second initial output 214, make the oscillator 1 can starting oscillation.In addition, the first initial output 211 and the second initial output 214 also can be electrically connected respectively the second input 12 and the first input end 11 of oscillator 1, in the present invention not as limit.
Vibration initialization circuit 2 also comprises power end Vdd and earth terminal GND(is illustrated in respectively in Fig. 3).Power end Vdd and earth terminal GND are electrically connected on oscillator signal detector 22 and vibration initiator 21, and power supply is provided to oscillator signal detector 22 and vibration initiator 21 via power end Vdd, and detailed annexation can, with reference to Fig. 3, repeat no more in this.
Oscillator signal detector 22 comprises input signal actuation switch 222 and logic switch 223.Input signal actuation switch 222 electric connection of power supply end Vdd and earth terminal GND, the second output signal O2 that reception oscillator 1 is exported, and according to the accurate output logic signal E in position of the second output signal O2.In this embodiment, the second output signal O2 that input signal actuation switch 222 reception oscillator 1 outputs 14 are exported, but the first output signal O1 that input signal actuation switch 222 also can reception oscillator 1 output 13 be exported in other embodiment.Logic switch 223 is electrically connected input signal actuation switch 222, and according to logical signal E activation initial signal S.
Fig. 3 is according to the circuit diagram of the vibration initialization circuit 2 of one embodiment of the invention.Vibration initiator 21 comprises diverter switch 212 and the first inverter 213.The first inverter 213 has input and output, for making signal inversion.Diverter switch 212 is electrically connected the first initial output 211, the second initial output 214 and earth terminal GND, and receives initial signal S.In the time that initial signal S is enabled, diverter switch 212 is electrically connected to the first input end of oscillator 1 11 input of the first inverter 213 via the first initial output 211; In the time of initial signal S disabled, diverter switch 212 disconnections are electrically connected with oscillator 1.
Diverter switch 212 comprises multiplexer 212A and transmission gate 212B.Multiplexer 212A comprises first input end 212A1, the second input 212A2, control end 212A3 and output 212A4.First input end 212A1 is electrically connected the first initial output 211, the second input 212A2 electrical connection earth terminal GND, and control end 212A3 receives initial signal S, and output 212A4 is electrically connected the input of the first inverter 213.Transmission gate 212B is electrically connected between the output and the second initial output 214 of the first inverter 213.
From the above, the initial signal S that diverter switch 212 is exported according to reception oscillator signal detector 22 logic switches 223 switches the connection status of multiplexer 212A first input end 212A1 and the second input 212A2.Furthermore, when initial signal, S is enabled, multiplexer 212A selects first input end 212A1 to be electrically connected to output 212A4, make the first input signal IN1 of oscillator 1 first input end 11 via the first initial output 211, the first input end 212A1 of multiplexer 212A and output 212A4 input to the input of the first inverter 213, to produce the second input signal IN2 of opposite polarity by the first inverter 213, and from the output of the first inverter 21 by the transmission gate 212B of conducting, the second initial output 214 and the second input 12 transmit the second input signal IN2 to oscillator 1, if initial signal S disabled, multiplexer 212A selects the second input 212A2 to be electrically connected to its output 212A4, and transmission gate 212B is also disconnected, and the initiator 21 that makes to vibrate disconnects and being electrically connected of oscillator 1.
The input of the first inverter 213 receives the signal of the output 212A4 output of multiplexer 212A, and in this embodiment, input receives the first input signal IN1, with the second input signal IN2 of producing opposite polarity from output to transmission gate 212B.
Transmission gate 212B, for signal transmission, in this embodiment, is transmission the second input signal IN2, makes the second input signal IN2 input to the second input 12 of oscillator 1 from the second initial output 214.In addition, in embodiments of the invention, the first input signal IN1 and the second input signal IN2 can be for example sinusoidal wave, therefore, when the first input signal IN1 is when for example sinusoidal wave, the first 213 of inverters generation is in contrast to the second input signal IN2 of sinusoidal wave polarity.
From the above, in the time that oscillator signal detector 22 detects that the first output signal O1 of oscillator 1 or the second output signal O2 have opposite polarity, represent that oscillator 1 successfully produces vibration, initial signal S disabled, diverter switch 212 will disconnect being electrically connected of vibration initiator 21 and oscillator 11; In the time that oscillator signal detector 22 detects that the position standard of the first output signal O1 or the second output signal O2 is fixed in fact, initial signal S is enabled, the multiplexer 212A of diverter switch 212 is electrically connected to the first initial output 211 input of the first inverter 213, make the input signal of the second initial output 214 and the input signal of the first initial output 211 anti-phase, that is at the first input signal IN1 and the second input signal IN2 when anti-phase, oscillator 11 starting oscillations.
The logic switch 223 of oscillator signal detector 22 comprises NAND gate 223A and the 3rd inverter 223B.NAND gate 223A has the first logic signal input end 223A1, the second logic signal input end 223A2 and output 223A3.In addition, above-mentioned logical signal E comprises the first logical signal E1 and the second logical signal E2, and the first logic signal input end 223A1 and the second logic signal input end 223A2 receive respectively the first logical signal E1 and the second logical signal E2 to produce a logic judged result.The 3rd inverter 223B has input and output, the output 223A3 of input electrical connection NAND gate 223A is with receive logic judged result, and output is exported anti-phase logic judged result to produce the control end 212A3 of initial signal S to the initiator 21 diverter switch 212A that vibrate.
The input signal actuation switch 222 of oscillator signal detector 22 comprises drag switch 222B in drag switch 222A in the first input signal level, the second inverter 222C, the second input signal level, the first input signal level maintainer 222D and the second input signal level maintainer 222E.Need pay special attention to, it has the characteristic of " unlatching " and " cutting out " switch described herein, represents that switch produces the state of " conducting " or " not conducting " for signal, and those skilled in the art should understand its meaning, are not described in detail in this.
Drag switch 222A electric connection of power supply end Vdd and there is input 222A1 and output 222A2 in the first input signal level.The first logic signal input end 223A1 of output 222A2 electrical connection NAND gate 223A, the second output signal O2 that input 222A1 reception oscillator 1 is exported, make drag switch 222A in the first input signal level open or close according to the level of the second output signal O2, to produce the first logic signal input end 223A1 of the first logical signal E1 to NAND gate 223A from output 222A2.In addition,, in this embodiment, in the time that drag switch 222A in the first input signal level opens, the first logical signal E1 is power supply (Vdd) level (high levle).
The second inverter 222C has input and output, and input is electrically connected the input 222A1 of drag switch 222A in the first input signal level, and the second output signal O2 of exporting of reception oscillator 1, in order to produce the first anti-phase output signal O1 to output.
Drag switch 222B electric connection of power supply end Vdd and there is input 222B1 and output 222B2 in the second input signal level.The second logic signal input end 223A2 of output 222B2 electrical connection NAND gate 223A, input 222B1 receives the first anti-phase output signal O1 from the second inverter 222C output, make drag switch 222B in the second input signal level open or close according to the level of the first anti-phase output signal O1, to produce the second logic signal input end 223A2 of the second logical signal E2 to NAND gate 223A from output 222B2.In this embodiment, in the time that drag switch 222B in the second input signal level opens, the second logical signal E2 is power supply level.
The first input signal level maintainer 222D is electrically connected between the first logic signal input end 223A1 and earth terminal GND, for in the time that drag switch 222A closes in the first input signal level, open the first input signal level maintainer 222D to produce the first logical signal E1 to the first logic signal input end 223A1.In this embodiment, in the time that the first input signal level maintainer 222D opens, the first logical signal E1 is ground connection (GND) level (low level).
The second input signal level maintainer 222E is electrically connected between the second logic signal input end 223A2 and earth terminal GND, for in the time that drag switch 222B closes in the second input signal level, open the second input signal level maintainer 222E to produce the second logical signal E2 to the second logic signal input end 223A2.In this embodiment, in the time that the second input signal level maintainer 222E opens, the second logical signal E2 is ground connection level.
From the above, the power supply level of the first logical signal E1 and the second logical signal E2 and ground connection level are according to the unlatching between drag switch 222B, the first input signal level maintainer 222D in drag switch 222A, the second input signal level in the first input signal level and the second input signal level maintainer 222E or state while closing produces, those skilled in the art should understand its meaning, are not described in detail in this.
In addition, when the level of the second output signal O2 that in drag switch 222A in the first input signal level and the second input signal level, drag switch 222B exports according to oscillator 1 is opened, make the first logical signal E1 of producing and the second logical signal E2 while being power supply level, export the input of logic judged result to the three inverter 223B of ground connection level by above-mentioned logic switch 223, and by the 3rd inverter 223B inverted logic judged result to produce the initial signal S of power supply level.
When the level of the second output signal O2 that in drag switch 222A in the first input signal level and the second input signal level, drag switch 222B exports according to oscillator 1 is closed, while making the first logical signal E1 and the second logical signal E2 be ground connection level, by the input of logic judged result to the three inverter 223B of above-mentioned logic switch 223 out-put supply levels, and by the 3rd inverter 223B inverted logic judged result to produce the initial signal S of ground connection level.
When the level of the second output signal O2 that in drag switch 222A in the first input signal level and the second input signal level, drag switch 222B exports according to oscillator 1 is opened respectively and closes, making the first logical signal E1 is that power supply level and the second logical signal E2 are while being ground connection level, by the input of logic judged result to the three inverter 223B of above-mentioned logic switch 223 out-put supply levels, and make logic judged result anti-phase to produce the initial signal S of ground connection level by the 3rd inverter 223B.
When the level of the second output signal O2 that in drag switch 222A in the first input signal level and the second input signal level, drag switch 222B exports according to oscillator 1 is closed respectively and opens, making the first logical signal E1 is that ground connection level and the second logical signal E2 are while being power supply level, by the input of logic judged result to the three inverter 223B of above-mentioned logic switch 223 out-put supply levels, and make logic judged result anti-phase to produce the initial signal S of ground connection level by the 3rd inverter 223B.
From the above, in the time that initial signal S is ground connection level, the first input end 212A1 of the multiplexer 212A of diverter switch 212 is electrically connected the first initial output 211 and output 212A4, and is exported the input of the first input signal IN1 to the first inverter 213 by output 212A4; In the time that initial signal S is power supply level, the first input end 212A1 of multiplexer 212A electrical connection earth terminal GND, to disconnect being electrically connected of vibration initiator 21 and oscillator 1.In other words, when initial oscillating circuit 2 of the present invention produces two anti-phase the first input signal IN1 and the second input signal IN2 to oscillator 1, oscillator 1 is produced after vibration, can export initial signal S to diverter switch 212 by logic switch 223, make the first input end 212A1 of the multiplexer 212A of diverter switch 212 be electrically connected to earth terminal GND, to avoid interference the running of oscillator 1.
In embodiments of the invention, the first input signal level maintainer 222D and the second input signal level maintainer 222E comprise respectively impedance and shunt capacitance; In the first input signal level, in drag switch 222A and the second input signal level, drag switch 222B comprises respectively PMOS.
In sum, provide two anti-phase input signals to oscillator by vibration initialization circuit of the present invention, can guarantee that oscillator produces vibration.Moreover, also can reduce oscillator by vibration initialization circuit of the present invention and set up the time of vibrating.In addition, vibration initialization circuit also has measuring ability, and for detection of the state of oscillator output signal, to guarantee after oscillator is set up vibration, disconnection vibration initialization circuit is electrically connected with oscillator, avoids producing the interference to oscillator.
The foregoing is only the preferred embodiments of the present invention, not in order to limit claim of the present invention; All other do not depart from the equivalence completing under the spirit that invention discloses and changes or modify, and all should be included in the scope of following claim.
Claims (16)
1. a vibration initialization circuit, for oscillator, comprising:
Oscillator signal detector, receives the output signal that described oscillator is exported, if detect, the position standard of described output signal is fixing in fact, the initial signal of output enable; And
Vibration initiator, when described initial signal is enabled, produces the first input signal and extremely first input end and second input of described oscillator of the second input signal of opposite polarity.
2. vibration initialization circuit as claimed in claim 1, also comprises: the first initial output and the second initial output, be electrically connected respectively described first input end and described second input of described oscillator, and be electrically connected described vibration initiator.
3. vibration initialization circuit as claimed in claim 2, wherein said vibration initiator comprises:
The first inverter, has input and output, for making described the first input signal or described the second input signal anti-phase; And
Diverter switch, when described initial signal is enabled, the described first input end of described oscillator is electrically connected to the input of described the first inverter via described the first initial output, and the output of described the first inverter is electrically connected to described second input of described oscillator via described the second initial output; When described initial signal disabled, diverter switch disconnects the electrical connection of described vibration initiator and described oscillator.
4. vibration initialization circuit as claimed in claim 3, wherein said diverter switch comprises:
Multiplexer, comprising:
First input end, is electrically connected described the first initial output;
The second input, electrical connection earth terminal;
Control end, receives described initial signal; And
Output, be electrically connected the input of described the first inverter, wherein said control end is according to received described initial signal, in the time that described initial signal is enabled, described first input end is electrically connected to described output, in the time of described initial signal disabled, described the second input is electrically connected to described output; And
Transmission gate, is electrically connected between the output and described the second initial output of described the first inverter, for transmitting described the first input signal or described the second input signal from the output output of described the first inverter.
5. vibration initialization circuit as claimed in claim 4, wherein said oscillator signal detector comprises:
Input signal actuation switch, electric connection of power supply end and earth terminal, receive the output signal that described oscillator is exported, and according to described output signal output logic signal; And
Logic switch, is electrically connected described input signal actuation switch, and produces described initial signal according to described logical signal;
Wherein, described logical signal comprises the first logical signal and the second logical signal.
6. vibration initialization circuit as claimed in claim 5, wherein said logic switch comprises:
NAND gate, it has the first logic signal input end, the second logic signal input end and output, and described the first logic signal input end and described the second logic signal input end receive respectively described the first logical signal and described the second logical signal to produce logic judged result; And
The 3rd inverter, is electrically connected the described output of described NAND gate, and makes described logic judged result anti-phase to produce the control end of described initial signal to described diverter switch.
7. vibration initialization circuit as claimed in claim 6, wherein said input signal actuation switch comprises:
Drag switch in the first input signal level, it is electrically connected described power end and has input and output, described input receives the output signal of described oscillator output, make drag switch in described the first input signal level open or close according to described output signal, to produce described the first logical signal from described output to described the first logic signal input end;
The second inverter, has input and output, and described input is electrically connected the input of drag switch in described the first input signal level, and receives the output signal of described oscillator output, uses so that described output signal is anti-phase;
Drag switch in the second input signal level, it is electrically connected described power end and has input and output, described input receives described anti-phase described output signal, make drag switch in described the second input signal level open or close according to described anti-phase described output signal, to produce described the second logical signal from described output to described the second logic signal input end;
The first input signal level maintainer, be electrically connected between the output and earth terminal of drag switch in described the first logic signal input end and described the first input signal level, for in the time that drag switch is closed in described the first input signal level, open the first input signal level maintainer to produce described the first logical signal to described the first logic signal input end; And
The second input signal level maintainer, be electrically connected between the output and described earth terminal of drag switch in described the second logic signal input end and described the second input signal level, for in the time that drag switch is closed in described the second input signal level, open the second input signal level maintainer to produce described the second logical signal to described the second logic signal input end.
8. vibration initialization circuit as claimed in claim 7, wherein said the first logical signal and described the second logical signal are power supply level and/or ground connection level.
9. vibration initialization circuit as claimed in claim 7, wherein said the first input signal level maintainer and described the second input signal level maintainer comprise respectively impedance and shunt capacitance.
10. vibration initialization circuit as claimed in claim 7, in wherein said the first input signal level, in drag switch and described the second input signal level, drag switch is PMOS.
11. vibration initialization circuits as claimed in claim 8, wherein, when drag switch in drag switch in described the first input signal level and described the second input signal level is opened according to the output signal of described oscillator output, while making described the first logical signal and described the second logical signal be described power supply level, described initial signal is power supply level.
12. vibration initialization circuits as claimed in claim 8, wherein, when drag switch in drag switch in described the first input signal level and described the second input signal level is closed according to the output signal of described oscillator output, while making described the first logical signal and described the second logical signal be described ground connection level, described initial signal is ground connection level.
13. vibration initialization circuits as claimed in claim 8, wherein,
When drag switch in drag switch in described the first input signal level and described the second input signal level is opened respectively and closes according to the output signal of described oscillator output, making described the first logical signal is described power supply level and described the second logical signal while being described ground connection level, and described initial signal is ground connection level.
14. vibration initialization circuits as claimed in claim 8, wherein, when drag switch in drag switch in described the first input signal level and described the second input signal level is closed respectively and opens according to the output signal of described oscillator output, making described the first logical signal is described ground connection level and described the second logical signal while being described power supply level, and described initial signal is ground connection level.
15. vibration initialization circuits as claimed in claim 11, wherein, in the time that described initial signal is power supply level, the first input end of the multiplexer of described diverter switch is electrically connected described earth terminal.
16. vibration initialization circuits as described in claim 12,13 or 14, wherein, in the time that described initial signal is ground connection level, the first input end of the multiplexer of described diverter switch is electrically connected described the first initial output, and the output of the multiplexer of described diverter switch is exported described the first input signal or described the second input signal.
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| CN201310032129.6A CN103973298B (en) | 2013-01-28 | 2013-01-28 | Vibration starting circuit |
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| CN201310032129.6A CN103973298B (en) | 2013-01-28 | 2013-01-28 | Vibration starting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337986A (en) * | 2020-05-18 | 2020-06-26 | 上海索迪龙自动化有限公司 | Sensor device and detection system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW395092B (en) * | 1998-08-27 | 2000-06-21 | Admtek Incorported | Method for oscillating and start up circuit for oscillator |
| US20020167364A1 (en) * | 2001-05-10 | 2002-11-14 | International Business Machines Corporation. | Bipolar ring oscillator with enhanced startup and shutdown |
| US7482888B1 (en) * | 2007-07-12 | 2009-01-27 | Zerog Wireless, Inc. | Fast startup resonant element oscillator |
| US20090289674A1 (en) * | 2008-05-26 | 2009-11-26 | Hong-Sing Kao | Phase-locked loop |
| CN101772809A (en) * | 2007-08-03 | 2010-07-07 | 飞思卡尔半导体公司 | Method and circuit for preventing high voltage memory disturb |
| US20110037527A1 (en) * | 2009-08-13 | 2011-02-17 | Texas Instruments Incorporated | Fast start-up crystal oscillator |
| CN102710217A (en) * | 2011-03-28 | 2012-10-03 | 联咏科技股份有限公司 | Oscillator and control circuit thereof |
-
2013
- 2013-01-28 CN CN201310032129.6A patent/CN103973298B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW395092B (en) * | 1998-08-27 | 2000-06-21 | Admtek Incorported | Method for oscillating and start up circuit for oscillator |
| US20020167364A1 (en) * | 2001-05-10 | 2002-11-14 | International Business Machines Corporation. | Bipolar ring oscillator with enhanced startup and shutdown |
| US7482888B1 (en) * | 2007-07-12 | 2009-01-27 | Zerog Wireless, Inc. | Fast startup resonant element oscillator |
| CN101772809A (en) * | 2007-08-03 | 2010-07-07 | 飞思卡尔半导体公司 | Method and circuit for preventing high voltage memory disturb |
| US20090289674A1 (en) * | 2008-05-26 | 2009-11-26 | Hong-Sing Kao | Phase-locked loop |
| US20110037527A1 (en) * | 2009-08-13 | 2011-02-17 | Texas Instruments Incorporated | Fast start-up crystal oscillator |
| CN102710217A (en) * | 2011-03-28 | 2012-10-03 | 联咏科技股份有限公司 | Oscillator and control circuit thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337986A (en) * | 2020-05-18 | 2020-06-26 | 上海索迪龙自动化有限公司 | Sensor device and detection system |
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