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Abstract
In this paper a technique to improve the common-mode rejection ratio (CMRR) at high frequencies in the OTA-C filters is proposed. The technique is applicable to most OTA-C filters using CMOS operational transconductance amplifiers (OTA) based on differential pairs. The presented analysis shows that a significant broadening of CMRR bandwidth can be achieved by using a differential pair with the bodies of transistors connected to AC ground, instead of using a pair with the bodies connected to the sources. The key advantages of the technique are: no increase in power consumption (except for an optional tuning circuit), a small increase of a chip area, a slight modification of the original filter. The simulation results for exemplary OTAs and a low-pass filter, designed in a 0.35 μm CMOS process, show the possibility of broadening the CMRR bandwidth several times.
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- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.2478/bpasts-2013-0074
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
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Bulletin of the Polish Academy of Sciences-Technical Sciences
no. 61,
pages 697 - 703,
ISSN: 0239-7528 - Language:
- English
- Publication year:
- 2013
- Bibliographic description:
- Blakiewicz G.: Technique to improve CMRR at high frequencies in CMOS OTA-C filters// Bulletin of the Polish Academy of Sciences-Technical Sciences. -Vol. 61, iss. 3 (2013), s.697-703
- DOI:
- Digital Object Identifier (open in new tab) 10.2478/bpasts-2013-0074
- Verified by:
- Gdańsk University of Technology
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