Patent ID: 6073848
Filing Date: 2000-06-13
Classification: G06K

Abstract:
A digital automatic gain control (AGC) circuit comprising:a) a plurality of serially connected gain stages, with each gain stage of said plurality of gain stages producing a gain stage output; andb) a gain controller for selectively sampling the gain stage outputs of at least two gain stages of said plurality of gain stages and for adjusting a gain of at least one gain stage of said plurality of gain stages based on said sampling, said gain controller includingi) a sensing circuit for selectively sampling the gain stage outputs of said at least two gain stages and producing a time-multiplexed digital output signal corresponding to the amplitudes of said selectively sampled gain stage outputs; andii) a gain-adjusting circuit for processing said time-multiplexed digital output signal and for adjusting the gain of at least one gain stage of said plurality of gain stages;whereby the gain stage output signal of the last gain stage is kept within a predetermined amplitude range.