Digital FSK demodulator circuit

Details Digital FSK demodulator circuit Digital FSK demodulator circuit

1984-10-01

1986-02-04

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 329126, 375 45, 375 80, 375 88, 375 91, H03K 906, H03D 300, H03D 306

Patent

active

045688826

ABSTRACT:
An FSK demodulator is disclosed suitable for use in a CMOS IC using switched capacitor circuits. The mark and space filters are each modified to produce sine and cosine outputs. These outputs are rectified separately and the result summed. The summed outputs are passed through low pass filters and applied to a comparator which determines which of the mark and space signals is dominant. The invention substantially reduces the size of the demodulator filter capacitors and improves the demodulation signal to noise ratio.

REFERENCES:
patent: 4471312 (1984-09-01), Severin
patent: 4481642 (1984-11-01), Hanson

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