Radio-frequency output level compensating circuit of portable ra

Details Radio-frequency output level compensating circuit of portable ra Radio-frequency output level compensating circuit of portable ra

1993-11-29

1996-04-23

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

455126, H04B 104

Patent

active

055112340

ABSTRACT:
A circuit for compensating a radio-frequency output level of a portable radio transceiver which full-duplex communicates by a power of battery is disclosed. The circuit includes a radio-frequency signal compensating device having a second power amplifier for power-amplifying an input radio-frequency signal up to a transmitting level corresponding to an input automatic power control voltage level, second transmitting circuit coupled to an output terminal of the second power amplifier for radio transmitting the amplified radio-frequency signal, second transmitting output control circuit for supplying a second automatic power control voltage to the second power amplifier in response to the input voltage of the predetermined output level, a second battery, and second power driving circuit for regulating the second battery voltage to the voltage of predetermined level and supplying the regulated voltage as an operational voltage of the respective units in the radio-frequency signal compensating device and a connecting circuit for connecting the voltage of predetermined output level to the second transmitting output control circuit and connecting an output of the first transmitting circuit to an input of the second power amplifier, and at the same time, providing a connection detecting signal to the first transmitting output control circuit.

REFERENCES:
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4636741 (1987-01-01), Mitzlaff
patent: 4654882 (1987-03-01), Ikeda
patent: 4989260 (1991-01-01), Meade
patent: 5036532 (1991-07-01), Mtroka et al.
patent: 5193219 (1993-03-01), Tamura
patent: 5203020 (1993-04-01), Sato et al.
patent: 5367556 (1994-11-01), Marui et al.

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