Carrier detection circuit

Details Carrier detection circuit Carrier detection circuit

1983-12-07

1985-11-19

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

324 78Q, 329126, 329166, 329192, 329132, 455229, 455234, H04B 1700

Patent

active

045545081

ABSTRACT:
A carrier detection circuit includes a rectification stage, an integrator, a comparator, and a digital counter. By utilizing a digital counter, long time constants are provided without the use of external components. If desired, a mark detect circuit is used when a mark must be present to signify the presence of carrier. Hysteresis is provided by the comparator to insure that slight fluctuations in the carrier level do not affect the comparison.

REFERENCES:
patent: 3746993 (1973-07-01), Ahmed et al.
patent: 4355406 (1982-10-01), Guidoux
patent: 4441082 (1984-04-01), Haque
"An Electrically-Programmable Switched Capacitor Filter" Authors: D. J. Allstot, R. W. Brodersen, P. R. Gray IEEE Journal of Solid State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 1034-1041.
"An MOS Digitally Controlled Analog Attenuator for Voiceband Signal", Authors: G. L. Baldwin, J. L. McCreary IEEE Journal of Solid State Circuits, vol. SC-14, No. 1, Feb. 1979, pp. 74-79.
"An Improved Receiver for Baseband Data Communication Using a Digitally Controlled AGC", Authors: G. Larsen, P. W. Besslich Int. J. Electronics, 1977, vol. 43, No. 6, pp. 593-598.

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