Digital automatic gain control employing two-stage gain-determin

Details Digital automatic gain control employing two-stage gain-determin Digital automatic gain control employing two-stage gain-determin

1996-12-31

1999-06-29

Chin, Stephen

Pulse or digital communications

Receivers

Automatic gain control

4552391, 4552451, H04B 116, H03L 500

Patent

active

059178655

ABSTRACT:
For use in an automatic gain control that receives a digital signal from a digital circuit having a given dynamic range and develops therefrom a gain signal to be applied to a variable gain amplifier, an analyzing circuit for, and method of, determining a magnitude of the gain signal. The analyzing circuit includes: (1) a peak sampling subcircuit that determines an average peak value of the digital signal over variable periods of time and (2) a gain signal adjustment subcircuit, coupled to the peak sampling subcircuit, that operates in a selected one of: (a) a search mode in which the gain signal adjustment subcircuit decreases the periods of time and adjusts the gain signal at a first rate until the average peak value falls within the dynamic range of the digital circuit and (b) a direct step mode in which the gain signal adjustment subcircuit increases the periods of time and adjusts the gain signal at a second rate as a function of a deviation of the average peak value from a target average peak value, the first rate being faster than the second rate, the analyzing circuit thereby applying a two-stage gain determination process to the digital signal to approach the target average peak value.

REFERENCES:
patent: 4499586 (1985-02-01), Cafarella et al.
patent: 4785418 (1988-11-01), Pearce et al.
patent: 5134631 (1992-07-01), Kingston et al.
patent: 5563916 (1996-10-01), Scarpa
patent: 5694436 (1997-12-01), Huang et al.

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