Radio-frequency power level control circuit of mobile radio tele

Details Radio-frequency power level control circuit of mobile radio tele Radio-frequency power level control circuit of mobile radio tele

1989-09-18

1992-03-31

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

455 99, H04B 104

Patent

active

051015072

ABSTRACT:
Disclosed is a circuit being capable of controlling RF-power levels without application of an additional controller to a booster module when trying to utilizing an hand-held radio telephone as a mobile radiophone for use in a vehicle. The circuit selects a correct level of RF-power output suitably corresponding to a desired mode of the mobile radiophone, in accordance with generating a plurality of bits of logic control signal. The circuit comprises a first voltage source of logic high level, second voltage source of logic low level, a switching circuit for selectively outputting the first or second voltage source through each bit of output port switched according to the first or second logic control signal, and apparatus for producing the radio-frequency power control voltage to control said radio-frequency power, by combination of resistors each having a given value according to the first and second voltage sources.

REFERENCES:
patent: 3914696 (1975-10-01), Evans
patent: 4636741 (1987-01-01), Mitzlaff

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