Programmable gain amplifier (PGA) with AGC in receiver section

Details Programmable gain amplifier (PGA) with AGC in receiver section Programmable gain amplifier (PGA) with AGC in receiver section

2005-03-01

2005-03-01

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

C455S226400, C455S232100, C375S345000

Reexamination Certificate

active

06862438

ABSTRACT:
A method and apparatus for dynamically controlling a programmable gain amplifier (PGA) to provide a plurality of gain steps thereby providing automatic gain control (AGC) in a receiver intermediate frequency (IF) stage comprising a succession of operational amplifiers wherein at least one is for providing fine gain control and wherein the gain of each fine gain amplifier is controlled by the resistance ratios of a plurality of selectively biased MOSFETs. In one embodiment of the invention, three coarse amplifiers are provided, each having a gain of either 0 dB or 12 dB based on the value of a two-state signal provided to each amplifier gain control input. A single fine gain amplifier has a gain of 0 dB, 3 dB, 6 dB or 9 dB based on the binary value of the two-bit signal provided to the amplifier. The combination of three coarse gain amplifiers and one fine gain amplifier provides for a total gain of 45 dB in 3 dB steps in the described embodiment of the invention. The output of the gain control circuitry also is fed into an inverter. The inverter output may be used as a received signal strength indicator for a desired signal.

REFERENCES:
patent: 5564091 (1996-10-01), Goldinger
patent: 6115417 (2000-09-01), Matsunaga et al.
patent: 6442380 (2002-08-01), Mohindra
patent: 6498929 (2002-12-01), Tsurumi et al.
patent: 6577852 (2003-06-01), Iwata et al.
patent: 6731160 (2004-05-01), Behzad

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