Transmission power control circuit and mobile communication syst

Details Transmission power control circuit and mobile communication syst Transmission power control circuit and mobile communication syst

1995-03-23

1996-10-15

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455115, 330129, H04B 104

Patent

active

055663630

ABSTRACT:
A transmission power control circuit for controlling a power level of a transmission signal is provided which comprises a variable attenuator (2) for adjusting the amplitude level of an input signal, a detection circuit for detecting an amplitude of the transmission signal via a branch circuit (5), a reference voltage source (7) for generating a reference voltage associated to a predetermined level of the transmission signal to be transmitted, a comparator (11) for comparing the reference and detection voltages, a clock generator (13), an up/down counter (12) for up or down counting pluses of a clock output from the clock generator, a D/A converter (14) for converting the count value of the counter, and a control circuit (10). The comparator subjects the counter to the up or down counting operation when the detection voltage is less or larger than the reference voltage to provide an attenuation control signal to the alternator through the D/A convertor so that attenuation level is adjusted, whereby the detection voltage substantially coincides with the reference voltage. The control circuit controls the reference voltage source to vary the level of said reference voltage in accordance with the transmission signal and controls the clock generator to generate the clock having a high frequency during a transition period of the reference voltage and a low frequency during the reference voltage being kept substantially constant, whereby change of the transmission power level can be executed at a relatively high speed without interference for the adjacent channels.

REFERENCES:
patent: 3969683 (1976-07-01), Fabricius
patent: 4807035 (1989-02-01), Sayliss

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