Method and apparatus for dynamically controlling the bias current in a receiver in response to the transmitter power
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United States of America Patent
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Aug 28, 2001
Grant Date -
N/A
app pub date -
Mar 4, 1998
filing date -
Mar 4, 1998
priority date (Note) -
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Abstract
A method and apparatus for minimizing the power consumed by a low-noise amplifier in a receiver portion of a full duplex transceiver when the transmit signal power of the transceiver as presented to the low-noise amplifier exceeds the receive signal power and would further cause the low-noise amplifier to enter into a compression state thereby introducing distortion onto the receive signal. A transmit power control indicator designates a modified transmit power level for use by the transceiver. The transmit portion of the transceiver alters the transmit power level accordingly while the receiver portion of the transceiver monitors the change in the transmit portion and generates a bias control signal altering the bias level of the low noise amplifier to a level compatible with the modified transmit power level. Such a tracking of the bias current of the low noise amplifier both facilitates the use of lower-isolation duplexers and also reduces power consumption for portable transceivers.
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