The Transactions of the Korean Institute of Electrical Engineers A (대한전기학회논문지:전력기술부문A)

The Korean Institute of Electrical Engineers (대한전기학회)
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A Study on The IC Design of 1[V] CMOS Operational Amplifier with Rail-to-rail Output Ranges

Rail-to-rail 출력을 갖는 1[V] CMOS Operational Amplifiler 설계 및 IC 화에 관한 연구

  • 전동환 (청주대 대학원 전자공학과) ;
  • 손상희 (청주대 공대 전자·정보통신·반도체공학과)
  • Published : 1999.04.01
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Abstract

A CMOS op amp with rail-to-rail input and output ranges is designed in a one-volt supply. The output stage of the op amp is used in a common source amplifier that operates in sub-threshold region to design a low voltage op amp with rail-to-tail output range. To drive heavy resistor and capacitor loads with rail-to-rail output ranges, a common source amplifier which has a low output resistance is utilized. A bulk-driven differential pair and a bulk-driven folded cascode amplifier are used in the designed op amp to increase input range and achieve 1 V operation. Post layout simulation results show that low frequency gain is about 58 ㏈ and gain bandwidth I MHz. The designed op amp has been fabricated in a 0.8${\mu}{\textrm}{m}$ standard CMOS process. The measured results show that this op amp provides rail-to-rail output range, 56㏈ dc gain with 1 MΩ load and has 0.4 MHz gain-bandwidth with 130 ㎊ and 1 kΩ loads.

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References

  1. IEEE JSSCC v.27 no.4 Low-Power CMOS Digital Design Chandrakasan A.(et al.)
  2. Dig. ISSCC '95 A 1V CMOS op-amp using bulk-driven MOSFETs P.E. Allen;B. J. Blalock;G. A. Rincon
  3. ISCAS '96 A One-Volt, 120uW, 1-MHz OTA for standard CMOS Technology B. J. Blalock;P.E. Allen