发明授权
- 专利标题： Circuit and method of amplifying a signal for a receiver
- 专利标题（中）： 放大接收机信号的电路和方法
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申请号： US122730申请日： 1998-07-27
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公开(公告)号： US6133793A公开(公告)日： 2000-10-17
- 发明人: Sin Kai Henry Lau , Timothy Ernest Seneff
- 申请人： Sin Kai Henry Lau , Timothy Ernest Seneff
- 申请人地址： IL Schaumburg
- 专利权人： Motorola, Inc.
- 当前专利权人： Motorola, Inc.
- 当前专利权人地址： IL Schaumburg
- 主分类号： H03F1/22
- IPC分类号： H03F1/22 ; H03F3/193 ; H03F3/191
摘要：
A transceiver (10) has a transmitter (12) and an image reject receiver (16). The image reject receiver (16) provides frequency translation of two modulated signals received from an antenna (14). The image reject receiver (16) has two mixers (22 and 32) to accomplish the frequency translation. One mixer (22) receives a modulated signal for GSM operation and the other mixer (32) receives a modulated signal for DCS/PCS operation. A local oscillator (24) generates another signal having a gain controlled by an amplifier (26) for supplying differential signals to both of the mixers (22 and 32). The amplifier (26) uses transistors (46 and 58) with inductors (40, 52, and 68) to generate the differential signals.
公开/授权文献
- US5372238A Method and apparatus for singularizing objects 公开/授权日：1994-12-13
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