基本信息:
- 专利标题： NOTCH FILTER FOR RIPPLE REDUCTION IN CHOPPER STABILIZED AMPLIFIERS
- 申请号：EP07762382.5 申请日：2007-01-26
- 公开(公告)号：EP1982411B1 公开(公告)日：2018-08-15
- 发明人： BURT, Rodney T. , ZHANG, Joy Y.
- 申请人： Texas Instruments Incorporated
- 申请人地址： P.O. Box 655474 Mail Station 3999 Dallas, TX 75265-5474 US
- 专利权人： Texas Instruments Incorporated
- 当前专利权人： Texas Instruments Incorporated
- 当前专利权人地址： P.O. Box 655474 Mail Station 3999 Dallas, TX 75265-5474 US
- 代理机构： Zeller, Andreas
- 优先权： US340223 20060126
- 国际公布： WO2007087630 20070802
- 主分类号： H03F1/02
- IPC分类号： H03F1/02 ; H03F1/26 ; H03F3/00 ; H03F3/387
摘要：
A chopper-stabilized amplifier receiving an input signal includes a first operational transconductance amplifier having an input chopper and an output chopper for chopping an output signal produced by the first operational transconductance amplifier. A switched capacitor notch filter filters the chopped output signal by operating synchronously with the chopping frequency of output chopper to filter ripple voltages that otherwise would be produced by the output chopper. In one embodiment, a second operational transconductance amplifier amplifies the notch filter output. The input signal is fed forward, summed with the output of the second operational transconductance amplifier, and applied to the input of a fourth operational transconductance amplifier. Ripple noise and offset are substantially reduced.
公开/授权文献:
IPC结构图谱:
| H | 电学 |
| --H03 | 基本电子电路 |
| ----H03F | 放大器 |
| ------H03F1/00 | 只用电子管，只用半导体器件或只用未特别指明的器件作为放大元件的放大器的零部件 |
| --------H03F1/02 | .为提高效率对放大器的改进，例如滑动甲类放大级，采用辅助振荡 |