Simplex transceiver employing a common piezoelectric element...

Details Simplex transceiver employing a common piezoelectric element... Simplex transceiver employing a common piezoelectric element...

H - Electricity

04

B

325/22

H04B 1/40 (2006.01)

Patent

CA 1202082

Abstract of the Disclosure A radio frequency transceiver is provided in which the crystal resonator and monolithic crystal filter devices therein all operate at or near the operating frequency of the transceiver, and which employs a single piezoelectric element to achieve the functions of receiver signal filtering, transmitter signal filtering, receiver local oscillator signal generation, and transmitter local oscillator siqnal generation. To achieve these functions, a crystal resonator and a monolithic crystal filter are situat- ed on the same substrate of piezoelectric material. The crystal resonator portion of the piezoelectric device is employed to control the frequency at which a local oscillator generates radio frequency energy. Such crystal controlled local oscillator is shared by a receiver mixer circuit and a transmitter mixer circuit. Switching circuitry is employed to switch the crystal filter portion of the piezoelectric device from the receiver signal path to the transmit- ter signal path.

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