发明授权
US5867777A Variable-gain amplifier circuit, offset control method in variable-gain
amplifier circuit, radio receiver with variable-gain amplifier circuit,
and radio receiving method in radio receiver with variable-gain
amplifier
失效
可变增益放大器电路，可变增益放大器电路中的偏移控制方法，具有可变增益放大器电路的无线电接收器和具有可变增益放大器的无线电接收机中的无线电接收方法
- 专利标题： Variable-gain amplifier circuit, offset control method in variable-gain amplifier circuit, radio receiver with variable-gain amplifier circuit, and radio receiving method in radio receiver with variable-gain amplifier
- 专利标题（中）： 可变增益放大器电路，可变增益放大器电路中的偏移控制方法，具有可变增益放大器电路的无线电接收器和具有可变增益放大器的无线电接收机中的无线电接收方法
-
申请号： US702154申请日： 1996-08-23
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公开(公告)号： US5867777A公开(公告)日： 1999-02-02
- 发明人: Takafumi Yamaji , Tetsuro Itakura , Hiroshi Tsurumi
- 申请人： Takafumi Yamaji , Tetsuro Itakura , Hiroshi Tsurumi
- 申请人地址： JPX Kawasaki
- 专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人地址： JPX Kawasaki
- 优先权： JPX7-217948 19950825
- 主分类号： H03G3/12
- IPC分类号： H03G3/12 ; H03F3/45 ; H03F3/72 ; H04B1/16 ; H04B1/18
摘要：
A variable-gain amplifier circuit has an offset correcting function by which the fluctuation of offset due to the switching of a gain is decreased. In an offset detection mode, an input offset voltage of the variable-gain amplifier circuit is inputted to an offset retaining section, and in a signal amplifying mode, the offset is corrected by subtracting the output of the offset retaining section from an input signal by means of an input section of the variable-gain amplifier circuit. In addition, the variable-gain amplifier circuit can be applied to a radio receiver. The offset produced in a baseband section of a receiver is corrected by the offset correcting function of the variable-gain amplifier circuit, so as to prevent the quality of communication from being deteriorated.
公开/授权文献
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