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A new method of frequency compensation for bipolar Wilson current mirror

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2 Author(s)
I. M. Filanovsky ; Dept. of Electr. & Comput. Eng., Alberta Univ., Edmonton, Alta., Canada ; W. H. Y. Lee

This paper proposes a new method of frequency compensation for a bipolar Wilson current mirror. The mirror is, first, modified: a resistor is inserted into the collector circuit of the diode-connected transistor, and another resistor of equal value is added into the emitter circuit of the same transistor. A compensation capacitor is connected between the collector and base of the feedback transistor. It is shown that the modification produces a pole-zero pair in the current-source transfer function. The split between pole and zero is reduced when the resistor value increases. This results in a wider bandwidth of the mirror transfer function and a faster step-transient response. These improvements are paid for in a small degradation of noise performance

Published in:

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing  (Volume:46 ,  Issue: 5 )