H - Electricity – 03 – F
Patent
H - Electricity
03
F
H03F 1/30 (2006.01) H03F 1/02 (2006.01) H03F 3/21 (2006.01) H03F 3/72 (2006.01) H04L 5/16 (2006.01)
Patent
CA 2279077
Disclosed is a method and apparatus for improving thermal efficiency and field reliability of a linear power amplifier of a communicating system. In as illustrative embodiment, the communication system operates in a half-duplex mode sad a transistor control terminal (e.g., gate) of the amplifier is biased at a first bias voltage during transmit intervals of the half-duplex mode. The control terminal is biased at a second bias voltage differ from the first bias voltage during receive intervals. The second bias voltage is sufficient to reduce idle currents in the amplifier during the receive intervals, thereby improving thermal efficiency of the amplifier. Also diseased is a base station including a base station controller, a variable bias control circuit and a linear power amplifier. The variable bias control circuit operates under the control of the base station controller to supply a variable bias voltage to the amplifier. Thermal efficiency of the amplifier is improved by reducing idle currents via appropriate bias voltage control during a weak signal transmitting mode and/or during receive intervals of a half-duplex operating mode.
Kirby Eades Gale Baker
Lucent Technologies Inc.
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