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Rail-to-rail amplifier input stage with constant gm and commonmode elimination

Rail-to-rail amplifier input stage with constant gm and commonmode elimination

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A new scheme for achieving rail-to-rail input to an amplifier is introduced. Constant gm and commonmode removal is obtained by using a single input differential pair and tunable DC level shifters via multiple input floating gate transistors. The feedback circuitry basically fixes the commonmode of the amplifier, resulting in consistent and stable operation for rail-to-rail inputs and a high commonmode rejection ratio.

Inspec keywords: circuit tuning; operational amplifiers; CMOS analogue integrated circuits; feedback amplifiers; differential amplifiers

Other keywords: constant transconductance; rail-to-rail amplifier input stage; tunable DC level shifters; single input differential pair; multiple input floating gate transistors; op-amp input stage; feedback circuitry; high CMRR; stable operation; common mode elimination; high common mode rejection ratio; constant gm

Subjects: Amplifiers; CMOS integrated circuits

References

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      • You, F., Embabi, S.H.K., Sinencio, E.S.: `A 1.5 V class Ab output buffer', Int. Symp. on Low Power Electronics and Design, 1996, Monterey, CA, USA, p. 285–288.
    2. 2)
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    4. 4)
      • Hogervorst, R., Wiegerink, R.J., de Jong, P.A.L., Fonderie, J., Wassenaar, R.F., Huijsing, J.H.: `CMOS low-voltage operational amplifiers with constant-g', IEEE Proc. ISCAS, 1992, San Diego, USA, p. 2876–2879.
    5. 5)
      • J. Ramirez-Angulo , R.G. Carvajal , J. Tombs , A. Torralba . Low-voltage CMOS op-amp with rail-to-rail input and output signal swing for continuous-time signal processing using multiple-input floating-gate transistors. IEEE Trans. Circuits Syst.-II: Analog Digit: Signal Process. , 1 , 111 - 116
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