Switched capacitor automatic gain control loop

Details Switched capacitor automatic gain control loop Switched capacitor automatic gain control loop

H - Electricity

03

G

330/104, 330/39

H03G 3/20 (2006.01)

Patent

CA 1203292

SWITCHED CAPACITOR AUTOMATIC GAIN CONTROL LOOP Yusuf A. Haque ABSTRACT OF THE INVENTION 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 (VO) of this operational amplifier is rectified, and the rectified signal is alternately integrated with a reference voltage (Vref) of opposite polarity to the rectified AGC signal. The polarity of the integrated voltages operates a counter stage (200). The output bits (O2-ON) 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.

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