发明申请
- 专利标题： Mixer circuit and receiver circuit using the same
- 专利标题（中）： 混频器电路和接收器电路使用相同
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申请号： US11072266申请日： 2005-03-07
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公开(公告)号： US20050197084A1公开(公告)日： 2005-09-08
- 发明人: Toshinori Hamasaki , Kaoru Ishida
- 申请人： Toshinori Hamasaki , Kaoru Ishida
- 申请人地址： JP Osaka
- 专利权人： MARSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
- 当前专利权人： MARSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
- 当前专利权人地址： JP Osaka
- 优先权： JP2004-063541 20040308
- 主分类号： H03D7/14
- IPC分类号： H03D7/14 ; H04B7/00
摘要：
A mixer circuit is provided with a quadrature demodulator including a Gilbert cell in which a first differential amplifier and a switching circuit are vertically stacked for connection and a bypass circuit including a second differential amplifier having a pair of differential input terminals short-circuited with each other, and provided in parallel with the first differential amplifier. Correction of a DC offset is performed by inactivating the first differential amplifier and activating the second differential amplifier, and detecting the DC offset under such state.
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