Automatic gain control circuit using gain shift

Details Automatic gain control circuit using gain shift Automatic gain control circuit using gain shift

2008-07-30

2011-10-04

Trinh, Sonny (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S232100, C455S250100

Reexamination Certificate

active

08032099

ABSTRACT:
An AGC circuit includes a low noise RF amplifying module with an adjustable gain, a frequency converter, an IF/Baseband amplifying module with an adjustable gain, an A/D converter, an AGC module and a gain distribution module. The AGC module is configured for detecting a level of a digital IF/Baseband signal outputted from the A/D converter, comparing the detected level with a reference level and generating a digital AGC signal and a digital gain distribution control signal based upon the comparison result. The gain distribution module is subject to control of the digital AGC signal and digital gain distribution control signal and configured for generating digital gain control signals to selectively adjust at least one of the gains of the low noise RF amplifying module and the IF/Baseband amplifying module in a digital manner to keep an IF/Baseband signal outputted from the IF/Baseband amplifying module at a desired level.

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Guang-Ming Wang et al. The method to realize programmable gain amplifier,Journal of Electric Engineer, Apr. 30, 2002,58-60,28-4,Chinese academic Journal Electronic Publishing House,CN.

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