| 摘要 |
The present invention provides a method and apparatus for auto-biasing an amplifier. The auto-bias system of the present invention has an auto-bias feedback loop that adjusts the bias condition of an amplifier to a wanted state between transmission periods. The system monitors a physical quantity indicative of the operating state of the amplifier and controls the amplifier bias so as to control the amplifier operating point sufficiently to compensate for variations in amplifier electrical characteristics, amplifier load, amplifier temperature, and input signals. The system further adjusts the amplifier operating point based on the modulation scheme used to modulate information included in an input signal provided to amplifier, thereby allowing the amplifier to operate in any one of multiple signal modulation systems.
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