Parallel feedforward class-AB control circuits for low-voltage bipolar rail-to-rail output stages of operational amplifiers |
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Authors: | W C M Renirie K J De Langen J H Huijsing |
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Affiliation: | (1) Department of Electrical Engineering, Delft University of Technology, The Netherlands |
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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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Keywords: | analog circuit design operational amplifiers low-voltage low-power class-AB output stages |
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