FSK demodulator with high noise immunity digital phase detector

Details FSK demodulator with high noise immunity digital phase detector FSK demodulator with high noise immunity digital phase detector

1985-11-07

1986-08-12

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 80, H03D 318

Patent

active

046059032

ABSTRACT:
A receiver for receiving and demodulating FSK modulated data signals has improved sensitivity over substantial frequency offsets between the transmitter and receiver local oscillator, and low spurious electromagnetic radiation. A quadrature coupler splits the received signal into in-phase and quadrature phase signals which are then mixed down to baseband, filtered, and limited. An RC circuit at the output of a four flip flop demodulator averages the flip flop output signals. A voltage comparator outputs a logical 1 if the voltage at the output of the RC averaging circuit is greater than one-half the supply voltage; otherwise the comparator outputs a logical zero.

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I. A. W. Vance; "Fully Integrated Radio Paging Receiver"; Feb. 1982; IEE Proc., vol. 129, Pt. F, No. 1, Feb. 1982.

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