Chopper stabilization is the most widely used circuit technique to reduce the influence of the flicker noise in an amplifier. Recently, observation of /f2 input-referred noise in the chopper amplifier with a high-impedance input source was reported. However, the mechanism of this /f2 phenomenon has not been completely analyzed. This paper provides the complete analysis of the noise influence generated by a chopper switch. The analysis suggests that the noise current of a chopper switch is directly fed to the output when the impedance of the input signal source is high. Then, the thermal noise of the chopper switch is reflected to the input showing /f2 characteristic while the flicker noise of the chopper switch is reflected to the input showing /f3 characteristic. This analysis has been verified with the simulation and measurement results.
|Title of host publication||IEEE 58th International Midwest Symposium on Circuits and Systems|
|Subtitle of host publication||Climbing to New Heights, MWSCAS 2015 - Conference Proceedings|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Publication status||Published - 2015 Sep 28|
|Event||58th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2015 - Fort Collins, United States|
Duration: 2015 Aug 2 → 2015 Aug 5
|Name||Midwest Symposium on Circuits and Systems|
|Other||58th IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2015|
|Period||15/8/2 → 15/8/5|
Bibliographical notePublisher Copyright:
© 2015 IEEE.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering