Inductorless active filter phase shift demodulator

Details Inductorless active filter phase shift demodulator Inductorless active filter phase shift demodulator

H - Electricity

03

D

329/11, 356/23

H03D 3/02 (2006.01) H03D 3/20 (2006.01)

Patent

CA 1282843

ABSTRACT An inductorless quadrature demodulator for frequency modulated signals is disclosed. A limited FM signal is passed through an active filter (26) and a phase shift network (30) to produce a quadrature signal. The limited FM signal is compared with the quadrature signal in an EXCLUSIVE OR gate (24) and then low pass filtered (36) to obtain recovered audio. The active filter (26) includes a transconductance amplifier (60) whose center frequency can be adjusted by appropriate adjustment of the amplifier's bias current. The bias current is temperature compensated to allow operation of the demodulator over a wide temperature range.

491095

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