Method for controlling the output power of digital cellular telephones
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United States of America Patent
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Jul 7, 1992
Grant Date -
N/A
app pub date -
Apr 22, 1991
filing date -
Apr 22, 1991
priority date (Note) -
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Abstract
A controlled power amplifier system (211) wherein a sample (225) of the output power level of an on/off switched power amplifier (215) is compared with a reference signal (227) to produce a power level control signal (275) that controls the output power level of the power amplifier (215). When the power amplifier (215) is switched off, the control signal (275) is maintained at the level it had just prior to the transition from an on to an off state. The switching is performed offset from the ends of each switched power amplifier pulse envelope to allow the pulse amplitude to be leveled in the center of the pulse and yet allow the pulse rise and fall times of the pulse envelope to follow the power amplifier input.
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