发明名称 |
Power control circuit for transmission apparatus |
摘要 |
<p>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. <IMAGE></p> |
申请公布号 |
EP0740422(A2) |
申请公布日期 |
1996.10.30 |
申请号 |
EP19960302940 |
申请日期 |
1996.04.26 |
申请人 |
SONY CORPORATION |
发明人 |
MIZUSAWA, NISHIKI;SATO, TSUTOMU |
分类号 |
H03C1/00;H03G1/02;H03G3/30;H03G5/16;H04B1/04;(IPC1-7):H03L5/02;H03G3/20 |
主分类号 |
H03C1/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|