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Parallel feedforward class-AB control circuits for low-voltage bipolar rail-to-rail output stages of operational amplifiers

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Abstract

A new family of class-AB control circuits for bipolar rail-to-rail output stages of operational amplifiers is presented. Step by step, we report the development of five simple class-AB control circuits showing the advantages of using parallel feedforward. The circuits have been designed in such a way that temperature, supply voltage and process parameters have little influence. To test the output stages, one of them has been implemented in a very simple two-stage operational amplifier on a semi-custom chip. Measurements show a bandwidth of 2.5 MHz, a gain of 40 dB, a quiescent current of 23µA and a maximum output current of 250µA. Simulation results of three other simple operational amplifiers with the new class-AB control circuits are shown, which have a higher gain and maximum output current.

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Authors and Affiliations

  1. Department of Electrical Engineering, Delft University of Technology, The Netherlands

    W. C. M. Renirie, K. J. De Langen & J. H. Huijsing

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  1. W. C. M. Renirie
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  2. K. J. De Langen
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  3. J. H. Huijsing
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Renirie, W.C.M., De Langen, K.J. & Huijsing, J.H. Parallel feedforward class-AB control circuits for low-voltage bipolar rail-to-rail output stages of operational amplifiers. Analog Integr Circ Sig Process 8, 37–48 (1995). https://doi.org/10.1007/BF01239378

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