Automatic gain control circuit using multiplier and negative fee

Details Automatic gain control circuit using multiplier and negative fee Automatic gain control circuit using multiplier and negative fee

1998-07-30

1999-10-26

Lee, Benny

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330 85, H03G 320

Patent

active

059735600

ABSTRACT:
An automatic gain control circuit and method is provided that constantly outputs uniform output signal size regardless of size change of an input signal. The automatic gain control circuit uses a multiplier and a negative feedback system. The automatic gain control circuit includes an amplitude detector detecting an amplitude of an input signal, a comparator, a multiplier multiplying the amplitude detected in the amplitude detector and an output signal. The output signal is fed back to the multiplier. The comparator has an inverting terminal coupled to an output terminal of the multiplier across a first resistance and coupled to an input terminal receiving the input signal across a second resistance. A non-inverting terminal of the comparator is grounded. The automatic gain control circuit and in particular, the comparator, supplies the output signal of which size is determined by the ratio of the first resistance and the second resistance regardless of the size of the input signal.

REFERENCES:
patent: 3588725 (1971-06-01), Geffe
patent: 4398153 (1983-08-01), Rittenbach
"Bipolar and MOS Analog Integrated Circuit Design", Alan B. Grebene, John Wiley & Sons, Copyright 1991, pp. 443-459.

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