发明授权
- 专利标题： Switching scheme to improve linearity and noise in switched capacitor stage with switched feedback capacitor
- 专利标题（中）： 开关电容器开关电容器级提高线性度和噪声的开关方案
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申请号： US10742183申请日： 2003-12-19
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公开(公告)号： US06970038B2公开(公告)日： 2005-11-29
- 发明人: Ramesh M. Chandrasekaran
- 申请人： Ramesh M. Chandrasekaran
- 申请人地址： US TX Dallas
- 专利权人： Texas Instruments Incorporated
- 当前专利权人： Texas Instruments Incorporated
- 当前专利权人地址： US TX Dallas
- 代理商 W. Daniel Swayze, Jr.; W. James Brady; Frederick J. Telecky, Jr.
- 主分类号： H03F1/02
- IPC分类号： H03F1/02 ; H03F1/14 ; H03F3/00
摘要：
A switch capacitor amplifier using a “bottom plate sampling” type arrangement in the feedback network to mitigate the reduction in linearity due to feedback switch charge injection. The switch (18A) connecting the feedback capacitor (Cf) to the opamp (15) input is opened prior to the switch (19A) connecting the feedback capacitor (Cf) to the output such that the charge injected into the opamp input nodes come from the switch connected to the opamp input, and is independent of the signal value to the first order as the switches are at the opamp input common mode voltage.
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