Method and/or architecture for implementing a variable gain amplifier control
AssigneeLSI Logic Corporation
InventorsLapoe E. Lynn, Samuel W. Sheng
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Abstract
An apparatus comprising a first circuit and a second circuit. The first circuit generally comprises one or more master amplifiers and a plurality of control amplifiers. The first circuit may be configured to generate a plurality of control signals in response to (i) a first signal related to a desired gain and (ii) a second signal related to a known reference. The second circuit may be configured to generate an output signal in response to (i) an input signal and (ii) the plurality of control signals. The output signal may be amplified with respect to the input signal.
Claims17
An apparatus comprising:
- a first circuit comprising one or more master amplifiers and a plurality of control amplifiers, wherein (A) said first circuit is configured to generate a plurality of control signals in response to (i) a first signal related to a desired gain and (ii) a second signal related to a known reference and (B) said one or more master amplifiers are configured to receive one or more of said control signals;
- and
- a second circuit configured to generate an output'signal in response to (i) an input signal and (ii) said plurality of control signals, wherein said output signal is amplified with respect to said input signal.
An apparatus comprising:
- means for generating a plurality of control signals in response to (i) a first signal related to a desired gain and (ii) a second signal related to a known reference, said means comprising one or more master amplifiers configured to receive one or more feedback control signals and a plurality of control amplifiers;
- and
- means for generating an output signal in response to (i) an input signal and (ii) said plurality of control signals, wherein said output signal is amplified with respect to said input signal.
A method for controlling a variable gain amplifier (VGA), comprising the steps of:
- (A) setting a control voltage to a predetermined value;
- (B) increasing said control voltage to reduce overall gain of the VGA;
- (C) allowing said control voltage to increase and sequentially decreasing a plurality of control signals;
- and
- (D) setting a ratio of a reference voltage to said control voltage below a minimum gain of the VGA, wherein (i) said plurality of control signals are at minimum values and (ii) said, steps are independently implemented in any order.
Dependencies are inferred from the claim text.