Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Patent
1981-10-09
1984-04-03
Mullins, James B.
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
330279, H03G 310
Patent
active
044410824
ABSTRACT:
An AGC circuit (12) contains a programmable gain stage comprising an operational amplifier (150) and one or more capacitor arrays (101, 121) for controlling the closed loop gain of the operational amplifier. The output signal (V.sub.O) of this operational amplifier is rectified, and the rectified signal is alternately integrated with a reference voltage (V.sub.ref) of opposite polarity to the rectified AGC signal. The polarity of the integrated voltages operates a counter stage (200). The output bits (0.sub.2 -0.sub.N) of the counter are used to control switches (134-2 through 134-N, 135-2 through 135-N, 110-2 through 110-N, 111-2 through 111-N) in the one or more capacitor arrays which control the closed loop gain of the operational amplifier of the AGC circuit of this invention.
REFERENCES:
patent: 4360787 (1982-11-01), Galpin
Allstot et al. "An Electrically-Programmable Switched Capacitor Filter" IEEE Journal of Solid-State Circuits, vol. SC. 14, No. 6, Dec. 1979, pp. 1034-1041.
Baldwin et al. "An MOS Digitally Controlled Analog Attenuator for Voiceband Signals" IEEE Journal of Solid State Circuits, vol. SC-14, No. 1, Feb. 1979.
Anon "Analogue Switches as C.M.O.S. Circuit Building Blocks" New Electronics, vol. 9, No. 2, pp. 20, 24-25, Jan. 27, 1976.
Larsen et al. "An Improved Receiver for Baseband Data Communication Using a Digitally Controlled AGC" Int. Journal of Elect. 1977, vol. 43, No. 6, pp. 593-598.
American Microsystems, Inc.
Caserza Steven F.
Franklin Richard
MacPherson Alan H.
Mullins James B.
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