Circuit and method of establishing DC bias levels in an RF power amplifier
First Claim
Patent Images
1. A multi-stage RF power amplifier comprising;
- a first power amplifier stage configured to amplify an input signal to generate an amplified output signal;
a second power amplifier stage; and
a circuit coupled to the first and second power amplifier stages, wherein the circuit is configured to generate a feedback signal using the input and output signals of the first power amplifier stage, and wherein the circuit is configured to control the DC bias level of the second power amplifier stage.
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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.
45 Citations
20 Claims
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1. A multi-stage RF power amplifier comprising;
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a first power amplifier stage configured to amplify an input signal to generate an amplified output signal; a second power amplifier stage; and a circuit coupled to the first and second power amplifier stages, wherein the circuit is configured to generate a feedback signal using the input and output signals of the first power amplifier stage, and wherein the circuit is configured to control the DC bias level of the second power amplifier stage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating an RF power amplifier having multiple power amplifier stages, comprising;
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providing a first power amplifier stage configured to amplify an input signal to generate an amplified output signal; providing a second power amplifier stage; and controlling the DC bias level of a second power amplifier stage based on the input and output signals of the first power amplifier stage. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of establishing DC bias levels in an RF power amplifier having multiple power amplifier stages, comprising:
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providing a first power amplifier stage having an input and an output; sensing the DC bias level of the input of the first power amplifier stage; sensing the DC bias level of the output of the first power amplifier stage; generating a signal based on the sensed DC bias levels of the input and output of the first power amplifier stage; and using the generated signal to control the DC bias level of the second power amplifier stage. - View Dependent Claims (17, 18, 19, 20)
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Specification