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US 7,064,605 B2Granted
Circuit and method of establishing DC bias levels in an RF power amplifier
AssigneeSilicon Laboratories Inc.
InventorsAlan L. Westwick, Susanne A. Paul
Life of this patent
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Abstract
A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noise, and to reduce the noise transfer function in a power amplifier.
Claims24
A method of establishing DC bias levels in an RF power amplifier having multiple power amplifier stages, comprising:
- providing a first power amplifier stage having an input and an output, wherein the first power amplifier stage amplifies an input signal received by the power amplifier stage input to generate an output signal at the power amplifier stage output;
- generating a feedback signal using the input signal and the output signal of a the first power amplifier stage;
- and using the feedback signal to control the DC bias level of a second power amplifier stage.
A method of establishing DC bias levels in an RF power amplifier having multiple power amplifier stages, comprising:
- providing a first power amplifier stage having an input for receiving an input signal, wherein the first power amplifier stage amplifies the input signal to generate an output signal at an output of the first power amplifier stage;
- sensing the DC bias level of the input signal and of the output signal of a the first power amplifier stage;
- generating a feedback signal using sensed DC bias levels;
- and
- coupling the feedback signal to a second power amplifier stage to control the DC bias level of the second power amplifier stage.
2 more elements
An RE power amplifier comprising:
- a first power amplifier stage having an input for receiving an RF input signal, wherein the first power amplifier stage amplifier the RF input signal to generate an output signal at an output of the power amplifier stage;
- a second power amplifier stage;
- and
- an amplifier having a first input coupled to the output of the first power amplifier stage, a second input coupled to the input of the first power amplifier stage for sensing the DC bias levels at the input and output of the first power amplifier stage, and an output coupled to the second power amplifier stage to control the DC bias level of the second power amplifier stage.
1 more element
Dependencies are inferred from the claim text.