Dual mode crystal phase shift oscillator

Details Dual mode crystal phase shift oscillator Dual mode crystal phase shift oscillator

H - Electricity

03

B

331/46

H03B 5/36 (2006.01)

Patent

CA 1279381

Abstract of the Disclosure An oscillator comprises an amplifier with a feedback loop from the output to the input thereof, the feedback loop including a resonator such as a crystal providing oscillation of the amplifier at a predetermined frequency. A balanced modulator coupled to the amplifier generates a voltage varying at the same frequency, said voltage being selectably variable in amplitude from zero upward either in phase with the amplifier or 180 degrees out of phase therewith. The voltage is selectably inserted into the feedback loop 90 degrees out of phase with the output of the amplifier, whereby, when it is inserted, the frequency of oscillation of the amplifier varies from the predetermined frequency in direction depending upon the phase relationship of the amplifier and voltage and in amount upon the amplitude of the voltage.

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