Power control circuit for transmission apparatus

Telecommunications – Transmitter and receiver at separate stations – With control signal

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Details

455126, 330129, H01Q 1112, H04B 104

Patent

active

06038428&

ABSTRACT:
A modulated signal from an orthogonal modulator is supplied to a mixer, and a second local oscillating signal from a second local oscillator is supplied through a variable gain amplifier to the mixer. A transmission signal from the mixer is supplied through a step-attenuator (ATT) to a power amplifier, and further supplied through a directional coupler and an isolator to an antenna. A signal from the directional coupler is supplied through a detector to a comparator, and a reference voltage from a reference voltage setting unit is supplied to the comparator. An output from the comparator is supplied to a control unit of the variable gain amplifier and a gain is thereby controlled such that a DC voltage from the detector and the reference voltage from the reference voltage setting unit become equal to each other. Further, an attenuation amount of the step-attenuator is set by an attenuation amount setting unit in accordance with a transmission output control signal from a base station.

REFERENCES:
patent: 5313658 (1994-05-01), Nakamura
patent: 5548826 (1996-08-01), Sayers
patent: 5574993 (1996-11-01), Kobayashi et al.
patent: 5646578 (1997-07-01), Loh et al.

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