A digital signal transceiver includes a frequency modulator for outputting a high-frequency signal frequency-modulated with a digital signal input thereto, a power amplifier, an antenna terminal, and an antenna switch. The antenna switch includes a first branch port for receiving a signal output from...http://www.google.co.uk/patents/US20040198418?utm_source=gb-gplus-sharePatent US20040198418 - Digital signal transceiver
