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A low-voltage operational amplifier with high slew-rate for sigma-delta modulators

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3 Author(s)
Joongho Choi ; Dept. of Electr. & Comput. Eng., Seoul Univ., South Korea ; Jinup Lim ; Cheng Chew Lim

This paper presents the design of a low-voltage operational amplifier suitable for sigma-delta (SigmaDelta) modulator applications. The circuit technique is proposed to enhance the slew-rate performance and correspondingly can help to save the power of the amplifier. The simple circuitry of a current mirror is included with a degenerate resistor that can be selectively shunted. High-speed 2nd-order SigmaDelta modulators incorporating this technique is designed in a 0.18-mum CMOS technology and power consumption can be saved more than 20% for a power supply voltage of 1.2V

Published in:

2006 IEEE International Symposium on Circuits and Systems

Date of Conference:

21-24 May 2006