Amplifier bias control circuit
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United States of America Patent
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May 13, 2003
Grant Date -
Oct 24, 2002
app pub date -
Apr 18, 2001
filing date -
Apr 18, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and apparatus for adjusting DC bias of a radio frequency (RF) amplifier for changing operating conditions such as multiple modulation techniques when no RF is present. A digitally controlled voltage source is programmed to maintain the amplifier bias. The voltage source can be a digitally controlled potentiometer. The amplifier's DC output current can be converted to a voltage and compared to a programmable reference representative of the optimal amplifier bias. The comparator output determines a direction to drive the voltage source. A digital clock is enabled to drive the voltage source when no RF is present. Alternatively, the amplifier's output current can be read by a processor that determines the optimal bias. The bias can be written to a data register that sets the voltage on the voltage source. The system automatically compensates for changes in the amplifier's optimal bias due to aging, temperature, and modulation scheme.
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