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US 7,605,652 B2Granted
Loop gain equalizer for RF power amplifier
AssigneeFreescale Semiconductor, Inc.
InventorsHugues Beaulaton, Gerald Haennig, Didier Salle
Life of this patent
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Abstract
The output power of an RF power amplifier is controlled using a feedback loop including a differential integrator for controlling the amplifier's bias voltage. The gain of integration in the differential integrator is varied so as to compensate for variations in the derivative of the power amplifier output power versus the bias voltage.
Claims20
A method of controlling the output power of an RF power amplifier, comprising the steps of:
- providing a bias control feedback loop arranged to determine the level of the power output by the amplifier and to control the biasing of the amplifier based on the determined power level, said bias control feedback loop including means for comparing the output power level with a reference value to produce an error signal and for integrating the error signal;
- and
- dynamically varying the gain of integration, applied by the comparing and integrating means, by modulating the gain of integration using a modulating function comprising a function approximately inverse to
- (
- ∂
- P
- out
- ∂
- V
- bias
- )
- ,
- wherein Pout is the output power of the power amplifier and Vbias is the bias voltage applied to the power amplifier by the bias control loop.
10 more elements
An RF power amplifier comprising:
- a bias control feedback loop, the bias control loop including means for comparing the output power level with a reference value to produce an error signal and for integrating the error signal;
- control means adapted, in use, to vary the gain of integration of the comparing and integrating means, depending on the present level of output power, by modulating the gain of integration using a modulating function comprising a function approximately inverse to
- (
- ∂
- P
- out
- ∂
- V
- bias
- )
- ,
- wherein Pout is the output power of the power amplifier and Vbias is the bias voltage applied to the power amplifier by the bias control loop.
9 more elements
A method of controlling the output power of an RF power amplifier, comprising the steps of:
- determining the level of the power output by the amplifier;
- controlling the biasing of the amplifier based on the determined power level;
- comparing the output power level with a reference value to produce an error signal and for integrating the error signal;
- and
- dynamically varying the gain of integration by modulating the gain of integration using a modulating function comprising a function approximately inverse to
- (
- ∂
- P
- out
- ∂
- V
- bias
- )
- ,
- wherein Pout is the output power of the power amplifier and Vbias is the bias voltage applied to the power amplifier.
12 more elements
Dependencies are inferred from the claim text.