Patent ID: 8183923
Filing Date: 2012-05-22
Classification: H03F,H03G

Abstract:
1. A constant signal gain system that applies gain to an externally applied voltage input signal to produce an output signal in which the level variation of said gain is reduced, comprising: a signal amplifier for providing said gain; a gain amplifier for providing a gain control signal with level of said gain control signal responsive to the difference in signal level between a signal responsive to said externally applied voltage input signal and a negative feedback signal; a time delay providing time delay between said input signal and said signal responsive to said input signal substantially equal to the time delay between said input signal and said negative feedback signal; said negative feedback signal having level responsive to said output signal level; a filter limiting said gain control signal frequency bandwidth less than said signal amplifier frequency bandwidth; said signal amplifier gain level responsive to level of said gain control signal; whereby level variation of said gain applied to said externally applied voltage input signal is reduced by maintaining said signal responsive to said externally applied voltage input signal and said negative feedback signal levels substantially equal.