Pulse or digital communications – Receivers – Automatic gain control
Patent
1995-06-05
1996-10-08
Chin, Stephen
Pulse or digital communications
Receivers
Automatic gain control
4552341, H04L 2708
Patent
active
055639160
ABSTRACT:
An apparatus and method for varying the slew rate of a digital AGC circuit is disclosed. A gain amplifier receiving an analog signal from a tuner is converted by an A/D converter into a digital form. An ABS circuit then obtains an absolute value level of the signal, which is then low pass filtered. The filtered signal is compared to a reference level to determine if the gain should be increased or decreased. The filtered signal is also communicated to a lock detect circuit to determine how far out of the desired range the signal is, thereby requiring large step changes for a fast, coarse adjustment or smaller step changes fine adjustment of the gain. An integrator combines the two results to determine the varying slew rate of the gain signal, which is converted back to the analog domain to control the amplifier.
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Chin Stephen
Hitachi America Ltd.
Sideris John J.
Vo Don
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