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US 2003/0201835 A1Published application
Power amplifier protection circuit
AssigneeRF Micro Devices, Inc.
InventorsDavid Dening, Kathleen Muhonen
Life of this patent
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Abstract
A power amplifier circuit comprises a sensing circuit and a processing circuit adapted to detect voltage peaks in an output of a power amplifier. If the voltage peak is above a predetermined threshold level, the processing circuit acts to reduce bias provided to the power amplifier, thereby reducing the output levels.
Claims16
A power amplifier circuit comprising:
- a power amplifier;
- a sensing circuit adapted to detect voltage peaks emitted by said power amplifier;
- and
- a processing circuit receiving an input from said sense circuit and damping said power amplifier to reduce said voltage peaks.
1 more element
A method of controlling a power amplifier comprising:
- sensing an output of said power amplifier with a sensing circuit;
- and
- reducing bias supplied to said power amplifier to reduce said output when said output exceeds a predetermined threshold.
A power amplifier circuit comprising:
- a power amplifier comprising an input and an output;
- a sensing circuit coupled to said output and detecting peaks in said output, said sensing circuit generating a control signal when a peak is detected;
- and
- a processing circuit receiving said control signal and adjusting a bias signal supplied to said power amplifier to reduce peaks in said output.
1 more element
A power amplifier circuit comprising:
- a power amplifier comprising an input and an output;
- a transistor coupled to said output and sensing voltage peaks in said output;
- and
- a current mirror coupled to said transistor and said input, said current mirror adjusting bias supplied to said input based on voltage peaks detected by said transistor.
1 more element
Dependencies are inferred from the claim text.