Detector for am-fm signals

Details Detector for am-fm signals Detector for am-fm signals

H - Electricity

03

D

329/19

H03D 5/00 (2006.01) H03D 1/18 (2006.01) H03D 3/14 (2006.01) H03D 3/20 (2006.01)

Patent

CA 1062779

ABSTRACT OF THE DISCLOSURE A detector for AM or FM signals is described. The det- ector employs a differentially connected emitter follower to which an in-phase and a phase-shifted signal are res- pectively applied. The emitter follower pair produces an output waveform which represents the greater of the applied waveforms. For FM operation, the phase shift is made linearly frequency dependent being in quadrature center frequency. In FM operation, zero crossings of the output waveform are sen- sed to produce a succession of variable width unidirectional pulses whose widths are proportional to frequency deviation. Amplifitude variations in the variable width pulses are removed, and integration in a filter with an audio frequency time constant recovers the FM modulation information. For AM operation, a phase shift of 180° is used, producing full wave rectification. The AM information is recovered from the rectified signal using the same integrating filter as for FM. The detector in a preferred form is form is fabricated as an integrated circuit.

219866

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