Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1989-09-05
1993-08-24
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
With feedback of modulated output signal
455343, H04B 104
Patent
active
052396959
ABSTRACT:
Radio-frequency (RF) power control circuit that facilitates establishment of RF power levels of the mobile radiophone, is disclosed. The circuit maintains constant RF power levels even if the variable resistor is displaced by vibrations and impacts caused by moving of the mobile radiophone. The circuit includes an automatic gain control circuit for amplifying the RF power of the modulated signal from a modulator by comparing the RF power control voltage and the voltage of the power amplified RF signal, first voltage source of high level, second voltage source of low level, a switching circuit for selectively outputting the first and second voltages sources according to the logic control signal of a plurality of bits generated by a logic controller under control of a cell site, and a device for producing the RF power control voltage according to the first and second voltage sources by combination of resistors each having a given value, each of the output terminals of the switching circuit being connected with one of the resistors in series, the resistors connected with the switching circuit being connected with another resistor.
REFERENCES:
patent: 3914696 (1975-10-01), Evans
Bushnell Robert E.
Eisenzopf Reinhard J.
SamSung Electronics Cp., Ltd.
Urban Edward
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