A Novel Adaptive Biasing Scheme for CMOS Op-Amps

  • Kurkure Girish (Department of Electrical 'Engineering' Indian Institute of Technology) ;
  • Dutta Aloke K. (Department of Electrical 'Engineering' Indian Institute of Technology)
  • Published : 2005.09.30

Abstract

In this paper, we present a new adaptive biasing scheme for CMOS op-amps. The designed circuit has been used in an Operational Transconductance Amplifier (OTA) with ${\pm}1$ V power supply, and it has improved the positive and negative slew rates from 2.92 V/msec to 1242 V/msec and from 1.56 V/msec to 133 V/msec respectively, while maintaining all the small-signal performance parameter values the same as that without adaptive biasing (as expected), however, there was a marginal decrease of the dynamic range. The most useful features of the proposed circuit are that it uses a very low number of components (thus not creating severe area penalty) and requires only 25 nW of extra stand-by power.

Keywords

References

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