Detector circuit having AGC function

Details Detector circuit having AGC function Detector circuit having AGC function

1982-04-13

1984-09-11

Heyman, John S.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329168, 329178, 330254, 455337, H03D 106, H03D 118

Patent

active

044713118

ABSTRACT:
An AM detector circuit capable of performing an AGC function having a wide dynamic range and low level of distortion and spurious interference. A first differential amplifier receives an amplitude-modulated signal to be detected as differential inputs. Outputs of the first differential amplifier are connected as constant current source inputs to second and third differential amplifiers. The differential inputs of the second and third differential amplifiers are fed with a signal synchronous with the carrier wave of the amplitude-modulated signal. Outputs of the second and third differential amplifiers are interconnected to provide multiplication outputs representing the product of the amplitude-modulated signal and its carrier wave. The detector AM signal is passed through a low-pass filter and then through a fourth differential amplifier to a current mirror circuit. The current mirror circuit feeds parallel-connected transistors of opposite conductivity types connected across the differential input of the first differential amplifier to provide the AGC function.

REFERENCES:
patent: 3488599 (1970-01-01), Csicsatka
patent: 3681614 (1972-08-01), Kroos
patent: 4048569 (1977-09-01), Yamatani
patent: 4297645 (1981-10-01), Tanaka et al.
patent: 4318050 (1982-03-01), Okanobu
patent: 4342000 (1982-07-01), Ogita
patent: 4360787 (1982-11-01), Galpin
patent: 4396891 (1983-08-01), Johansson et al.

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