Steven R Bender

US Patent:

41174100, Sep 26, 1978

Filed:

Oct 13, 1977

Appl. No.:

5/841611

Inventors:

Steven Frank Bender - Burnsville MN

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03D 318

US Classification:

329 50

Abstract:

An FM demodulator and detector suitable for integration including a phase locked loop for locking to an FM signal and recovering the modulating signal and squelch circuitry coupled to the phase locked loop for gating out the recovered modulating signal. The phase locked loop includes an emitter coupled multivibrator whose phase shifted output is applied together with the FM signal to the squelch circuitry for quadrature phase detection, followed by filtering to derive an indication signal for controlling the gating of the recovered modulating signal.