Controlling transmission mode on basis of power in preceding...

Details Controlling transmission mode on basis of power in preceding... Controlling transmission mode on basis of power in preceding...

2007-02-13

2007-02-13

Trinh, Sonny (Department: 2618)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S127200, C455S102000

Reexamination Certificate

active

10936511

ABSTRACT:
A transmitter2comprises a power amplifier3and power controller4. The power amplifier3is capable of both linear and non-linear operation, and is controlled by a controller20and first and second control loops21,22. The second control loop22is used with the transmission of GMSK modulated signals, which have no amplitude modulation, operating the power amplifier3in a non-linear mode. The first control loop21is used for the transmission of EDGE modulated signals, which have a substantial amount of amplitude modulation, operating the power amplifier3in a linear mode. The first control loop21is also used with GMSK time slots if the output power to be produced by the power amplifier3is low and the power of an immediately preceding time slot is high. In this case, a sample and hold circuit9, 10of the first control loop21is used when the power detector voltage in the power amplifier would change over the time slot by cooling, avoiding the possibility of the power level varying over the time slot.

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patent: 2005/0266811 (2005-12-01), Weiss
patent: 2005/0282508 (2005-12-01), Huang et al.

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