Frequency discriminator

Details Frequency discriminator Frequency discriminator

H - Electricity

03

D

H03D 3/00 (2006.01) H03D 3/22 (2006.01)

Patent

CA 2069967

A frequency discriminator is provided which comprises a phase shifter for shifting a phase of an IF signal, a multiplier for analogically multiplying the IF signal and an output signal of the phase shifter and outputting the resultant signal thus obtained as a differential current, a circuit for forming a differential current of a differential output current of the multiplier, an inverter circuit to be driven by the differential current thus formed, and a low- pass filter for integrating an output signal of the inverter circuit. As the circuit for forming the differential current thereof, a current mirror circuit is preferably used. Thus, a quadrature-type frequency discriminator can be realized on a C-MOS integrated circuit.

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