FSK Demodulator employing a switched capacitor filter and period

Details FSK Demodulator employing a switched capacitor filter and period FSK Demodulator employing a switched capacitor filter and period

1981-11-05

1985-05-14

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329110, 375 45, 375 88, 375 94, 375 95, 375103, H03D 300, H04L 2714

Patent

active

045175195

ABSTRACT:
An FSK demodulation circuit especially suited for integrated construction is provided. The demodulating circuit uses N counters and a counter selector circuit for sequentially switching the counters at every zero-cross point in the received FSK signal. Sensitivity of demodulation is improved by N-time zero-cross detection rather than counting the time between two adjacent zero-cross points. The FSK demodulation circuit uses a Switched Capacitor Bandpass Filter whose characteristics are changed by changing the frequency of an internal clock using simple dividing circuitry.

REFERENCES:
patent: 3636257 (1972-01-01), Dixon
patent: 3657661 (1972-04-01), Jarger
Budai, Z., "Type TAM-600 Data Transmission Modem" Budavox Telecommun. Rev., pp. 8-16, n. 4 (1974).
Hosticka, B. J. et al., "MOS Sampled Data Recursive Filters Using Switched Capacitor Integrators", IEEE Journal of Solid State Circuits, v. SC-12, n. 6, pp. 600-608, Dec. 1977.

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