发明授权
- 专利标题： Programmable gain instrumentation amplifier having improved dielectric absorption compensation and common mode rejection ratio
- 专利标题（中）： 可编程增益仪表放大器具有改善的介电吸收补偿和共模抑制比
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申请号： US11019008申请日： 2004-12-21
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公开(公告)号： US07095280B2公开(公告)日： 2006-08-22
- 发明人: Christopher G. Regier , Lauren Sjoboen , Antony Wangsanata , Clayton H. Daigle
- 申请人： Christopher G. Regier , Lauren Sjoboen , Antony Wangsanata , Clayton H. Daigle
- 申请人地址： US TX Austin
- 专利权人： National Instruments Corporation
- 当前专利权人： National Instruments Corporation
- 当前专利权人地址： US TX Austin
- 代理机构： Meyertons Hood Kivlin Kowert & Goetzel, P.C.
- 代理商 Jeffrey C. Hood; Mario J. Lewin
- 主分类号： H03F3/45
- IPC分类号： H03F3/45
摘要：
A PGIA for use in measurement devices (e.g., data acquisition device) having improved dielectric absorption (DA) compensation and common mode rejection ratio (CMRR). When a step function is applied to an input of the PGIA, a first and a second DA compensation circuit may generate DA compensation signals derived from the step function. The DA compensation signals may combine with an original response of the PGIA to cancel some of the dielectric absorptions effects and improve the overall step response of the PGIA. An input stage of the PGIA may include a CMRR enhancement circuit to increase symmetry at the inputs of the PGIA. The CMRR enhancement circuit may delay an input signal received at a negative input terminal a particular amount such that it is in phase with an input signal received at a positive input terminal of the PGIA, to improve the CMRR.
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