A high CMRR, class AB, fully differential current output stage

  • Authors:

  • Hassan Faraji Baghtash;Ahmad Ayatollahi

  • Affiliations:

  • Department of Electrical and Electronics Engineering, Iran University of Science and Technology (IUST), Tehran, Iran 1684613114;Department of Electrical and Electronics Engineering, Iran University of Science and Technology (IUST), Tehran, Iran 1684613114

  • Venue:
  • Analog Integrated Circuits and Signal Processing
  • Year:
  • 2014

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Abstract

A true class `AB' fully differential current output stage with very high common mode rejection ratio is presented in this study. The operational principle of this unique structure is discussed, its most important formulas are derived and its outstanding performance is verified by SPICE simulation in TSMC 0.18 μm CMOS, and Level49 technology. Owing to the elaborately arranged components, the proposed circuit demonstrates very high common-mode rejection ratio (CMRR), high slew rate, high current drive capability, high output compliance, and very low power consumption while operating at power supply of 卤0.9 V. The interesting results such as current drive capability of 卤100 μA, high output voltage swing of 卤0.8 V, low static power consumption of 21 μW, and very high CMRR of 84.5 dB is achieved utilizing standard CMOS technology. The performance of circuit at the presence of process and voltage variations evaluated through corner case and Monte Carlo analysis. The harmonic distortion is evaluated to investigate the circuit's linearity. The transient stepwise response analysis is also done to verify the stability of proposed class `AB' FDCOS.