CA2017926A1 - Second order active filters - Google Patents

Second order active filters

Info

Publication number
CA2017926A1
CA2017926A1 CA2017926A CA2017926A CA2017926A1 CA 2017926 A1 CA2017926 A1 CA 2017926A1 CA 2017926 A CA2017926 A CA 2017926A CA 2017926 A CA2017926 A CA 2017926A CA 2017926 A1 CA2017926 A1 CA 2017926A1
Authority
CA
Canada
Prior art keywords
reactance
potential divider
pass
amplifier
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2017926A
Other languages
French (fr)
Other versions
CA2017926C (en
Inventor
Petre Popescu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of CA2017926A1 publication Critical patent/CA2017926A1/en
Application granted granted Critical
Publication of CA2017926C publication Critical patent/CA2017926C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers

Abstract

SECOND ORDER ACTIVE FILTERS

Abstract of the Disclosure A family of second order active filters is described. A general form of the filter comprises an input terminal, an output terminal, and a common terminal, a first reactance and a resistance coupled in series between the input and common terminals, a first amplifier coupled from a connection point between the first reactance and the resistance to the output terminal, a first potential divider between the input terminal and one of the output and common terminals, a second amplifier coupled from a tapping point of the first potential divider via a second reactance to the connection point, a second potential divider between the output terminal the the common terminal, and a third amplifier coupled from a tapping point of the second potential divider via a third reactance to the connection point, at least one of the reactances being inductive and at least one other being capacitive. Different configurations are described for low-pass, notch, high-pass, band-pass, and all-pass filters, in some of which the first potential divider and second amplifier and second reactance, or the second potential divider and third amplifier and third reactance, are omitted.
CA002017926A 1989-12-14 1990-05-30 Second order active filters Expired - Fee Related CA2017926C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/450,790 US5006810A (en) 1989-12-14 1989-12-14 Second order active filters
US450,790 1989-12-14

Publications (2)

Publication Number Publication Date
CA2017926A1 true CA2017926A1 (en) 1991-06-14
CA2017926C CA2017926C (en) 1993-11-16

Family

ID=23789491

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002017926A Expired - Fee Related CA2017926C (en) 1989-12-14 1990-05-30 Second order active filters

Country Status (2)

Country Link
US (1) US5006810A (en)
CA (1) CA2017926C (en)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
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US5151662A (en) * 1991-06-24 1992-09-29 Motorola, Inc. Circuit and method of signal differentiation
US5694439A (en) * 1995-03-21 1997-12-02 Intel Corporation Bi-directional low pass filtering method and apparatus
US6091940A (en) 1998-10-21 2000-07-18 Parkervision, Inc. Method and system for frequency up-conversion
US7515896B1 (en) 1998-10-21 2009-04-07 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
US6061551A (en) 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for down-converting electromagnetic signals
US6694128B1 (en) 1998-08-18 2004-02-17 Parkervision, Inc. Frequency synthesizer using universal frequency translation technology
US6370371B1 (en) 1998-10-21 2002-04-09 Parkervision, Inc. Applications of universal frequency translation
US6542722B1 (en) 1998-10-21 2003-04-01 Parkervision, Inc. Method and system for frequency up-conversion with variety of transmitter configurations
US6061555A (en) 1998-10-21 2000-05-09 Parkervision, Inc. Method and system for ensuring reception of a communications signal
US6813485B2 (en) 1998-10-21 2004-11-02 Parkervision, Inc. Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same
US6049706A (en) 1998-10-21 2000-04-11 Parkervision, Inc. Integrated frequency translation and selectivity
US7236754B2 (en) 1999-08-23 2007-06-26 Parkervision, Inc. Method and system for frequency up-conversion
US7039372B1 (en) 1998-10-21 2006-05-02 Parkervision, Inc. Method and system for frequency up-conversion with modulation embodiments
US6560301B1 (en) 1998-10-21 2003-05-06 Parkervision, Inc. Integrated frequency translation and selectivity with a variety of filter embodiments
US6704549B1 (en) 1999-03-03 2004-03-09 Parkvision, Inc. Multi-mode, multi-band communication system
US6704558B1 (en) 1999-01-22 2004-03-09 Parkervision, Inc. Image-reject down-converter and embodiments thereof, such as the family radio service
US6853690B1 (en) 1999-04-16 2005-02-08 Parkervision, Inc. Method, system and apparatus for balanced frequency up-conversion of a baseband signal and 4-phase receiver and transceiver embodiments
US6879817B1 (en) 1999-04-16 2005-04-12 Parkervision, Inc. DC offset, re-radiation, and I/Q solutions using universal frequency translation technology
US7693230B2 (en) 1999-04-16 2010-04-06 Parkervision, Inc. Apparatus and method of differential IQ frequency up-conversion
US7110444B1 (en) 1999-08-04 2006-09-19 Parkervision, Inc. Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations
US7065162B1 (en) * 1999-04-16 2006-06-20 Parkervision, Inc. Method and system for down-converting an electromagnetic signal, and transforms for same
US8295406B1 (en) 1999-08-04 2012-10-23 Parkervision, Inc. Universal platform module for a plurality of communication protocols
US7010286B2 (en) 2000-04-14 2006-03-07 Parkervision, Inc. Apparatus, system, and method for down-converting and up-converting electromagnetic signals
US7454453B2 (en) 2000-11-14 2008-11-18 Parkervision, Inc. Methods, systems, and computer program products for parallel correlation and applications thereof
US6541977B2 (en) * 2001-02-13 2003-04-01 Pulsar 2000, Inc. Electronic water line tracer
US7072427B2 (en) 2001-11-09 2006-07-04 Parkervision, Inc. Method and apparatus for reducing DC offsets in a communication system
US7379883B2 (en) 2002-07-18 2008-05-27 Parkervision, Inc. Networking methods and systems
US7460584B2 (en) 2002-07-18 2008-12-02 Parkervision, Inc. Networking methods and systems
TWI280690B (en) * 2003-03-18 2007-05-01 Tdk Corp Electronic device for wireless communications and reflector device for wireless communication cards
JP2010512045A (en) * 2006-11-30 2010-04-15 ジィオン インコーポレイテッド Active LC bandpass filter, receiving system including the same, and electric signal processing method
WO2008146365A1 (en) * 2007-05-29 2008-12-04 Fujitsu Limited Controller and storage device
US11799451B2 (en) * 2020-03-13 2023-10-24 Netcom, Inc. Multi-tune filter and control therefor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1413722A (en) * 1973-01-17 1975-11-12 Post Office Filter networks
CA1101101A (en) * 1977-07-11 1981-05-12 Enn Vali Variable response notch filter for machine resonance elimination in a servo control system
US4594648A (en) * 1984-11-28 1986-06-10 Venus Scientific Inc. Wide frequency band coupling network for an active ripple and noise filter

Also Published As

Publication number Publication date
US5006810A (en) 1991-04-09
CA2017926C (en) 1993-11-16

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