| 发明名称 |
VARIABLE GAIN AMPLIFIER CIRCUIT AND COMMUNICATION DEVICE USING THE SAME |
| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a variable gain amplifier circuit suppressing a gain deviation. <P>SOLUTION: The variable gain amplifier circuit includes a bypass switch SWb 13 of which one end is connected to a first connection node N1 between an input resistor Ri 10 of a first variable gain amplifier 11 and an input switch SWi 10, and another end is connected to an input end of an operational amplifier OP 3 of a second variable gain amplifier 13 disposed on the post-stage side of the first variable gain amplifier. <P>COPYRIGHT: (C)2013,JPO&INPIT |
| 申请公布号 |
JP2013017130(A) |
申请公布日期 |
2013.01.24 |
| 申请号 |
JP20110150205 |
申请日期 |
2011.07.06 |
| 申请人 |
FUJITSU SEMICONDUCTOR LTD |
发明人 |
MURAKAMI KOTARO;SAKAMOTO SHINGO |
| 分类号 |
H03G3/12;H03G3/00 |
主分类号 |
H03G3/12 |
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