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Class AB output stage for low voltage CMOS op-amps with accurate quiescent current control

Class AB output stage for low voltage CMOS op-amps with accurate quiescent current control

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Published

A new class AB output stage for CMOS op-amps, with accurate quiescent and minimum current control, is proposed. The proposed stage can be operated with a supply voltage close to the threshold voltage of the transistor. A dynamic biasing scheme allows it to operate over a wide range of supply voltages. Simulation results are provided that are in good agreement with expected values.

Inspec keywords: CMOS analogue integrated circuits; low-power electronics; operational amplifiers

Other keywords: supply voltages; dynamic biasing scheme; class AB output stage; supply voltage; quiescent current control; low voltage CMOS op-amps; threshold voltage

Subjects: Amplifiers; CMOS integrated circuits

References

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      • J. Ramírez-Angulo , R.G. Carvajal , J. Tombs , A. Torralba . A simple technique for opamp continuous-time 1V supply operation. Electron. Lett. , 4 , 263 - 264
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      • G. Giustolisi , G. Palmisano , G. Palumbo , T. Segreto . 1.2 V CMOS op-amp with a dynamically biased output stage. IEEE J. Solid-State Circuits , 4 , 632 - 636
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      • V. Peluso , P. Vancoreland , A.M. Marques , M.S.J. Steyaert , W. Sansen . A 900mV low-power ΔΣ A/D converter with 77dB dynamic range. IEEE J Solid-State Circuits , 12 , 1887 - 1897
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