Circuit and method of establishing DC bias levels in an RF power amplifier
First Claim
Patent Images
1. A method of establishing DC bias levels in an RF power amplifier having multiple power amplifier stages, comprising:
- generating a feedback signal using the input and output of a first power amplifier stage; and
using the feedback signal to control the DC bias level of a 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.
38 Citations
25 Claims
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1. A method of establishing DC bias levels in an RF power amplifier having multiple power amplifier stages, comprising:
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generating a feedback signal using the input and output of a first power amplifier stage; and
using the feedback signal to control the DC bias level of a second power amplifier stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of establishing DC bias levels in an RF power amplifier having multiple power amplifier stages, comprising:
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sensing the DC bias level at the input and at the output of a 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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19. An RF power amplifier comprising:
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a first 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. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification