Automatic gain control circuit and method and...

Details Automatic gain control circuit and method and... Automatic gain control circuit and method and...

2007-09-18

2007-09-18

Kinkead, Arnold (Department: 2817)

Oscillators

Amplitude control or stabilization

Automatic

C331S182000, C331S175000, C331S074000

Reexamination Certificate

active

11160286

ABSTRACT:
An automatic gain control (AGC) circuit is applied to control a margin voltage of an oscillator. The margin voltage is the voltage difference between a high-level output and a low-level output of the oscillator. The AGC circuit of the present invention includes a comparator and a processing unit. Wherein, the comparator compares the margin voltage of the oscillator and a reference voltage. Based on the output of the comparator, the processing unit outputs a ripple code to determine the value of a driving current output from a current generator. The oscillator generates an oscillation output to the comparator based on the driving current.

REFERENCES:
patent: 6864756 (2005-03-01), Peng
patent: 2003/0025566 (2003-02-01), Rogers
patent: 2004/0212444 (2004-10-01), Peng
Article titled “A Low-Power CMOS Super-Regenerative Receiver at 1 GHz” published by Alexandre Vouilloz on Mar. 2001 (12 pages).

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