Power control circuit for a digital radio telephone

Details Power control circuit for a digital radio telephone Power control circuit for a digital radio telephone

1993-10-19

1996-04-09

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455115, 455127, 330129, 330284, H04B 104

Patent

active

055070167

ABSTRACT:
A power control device for a digital radio telephone has a variable attenuating circuit for changing input transmit power by a variable amount, a power amplifying circuit for amplifying the input transmit power applied from the variable attenuating circuit, a power detecting circuit for determining whether or not output transmit power has a necessary value, and outputting a voltage proportional to the output transmit power, a reference voltage generating circuit for generating a reference voltage for producing output transmit power having the necessary value, an error detecting circuit for producing a difference between the voltage proportional to the output transmit power and the reference voltage, a voltage generating circuit for generating a control voltage, a holding circuit for holding an output voltage even when an input voltage is absent, and changing, in response to the input voltage, an amount of attenuation of the variable attenuating circuit with the output voltage, a switching circuit for selectively applying the output voltage of the error detecting circuit or the control voltage of the voltage generating circuit to the holding circuit, and a control circuit for controlling the reference voltage generating circuit, voltage generating circuit and switching circuit by sending controls signals thereto.

REFERENCES:
patent: 4656630 (1987-04-01), Miyo
patent: 4757502 (1988-07-01), Meuriche et al.
patent: 4905086 (1990-02-01), Tahara
patent: 5054116 (1991-10-01), Davidson
patent: 5128629 (1992-07-01), Trinh
patent: 5138277 (1992-08-01), Robinson et al.
patent: 5172071 (1992-12-01), Braathen

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