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Impedance Adapting Compensation for Low-Power Multistage Amplifiers

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5 Author(s)
Xiaohong Peng ; Electron. Eng. Dept., Beijing Univ. of Technol., Beijing, China ; Sansen, Willy ; Ligang Hou ; Jinhui Wang
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A power-efficient frequency compensation topology, Impedance Adapting Compensation (IAC), is presented in this paper. This IAC topology has, on one hand, a normal Miller capacitor, which is still needed to provide an internal negative feedback loop, and on the other hand, a serial RC impedance as a load to the intermediate stage, improving performance parameters such as stability, gain-bandwidth product and power dissipation. A three-stage IAC amplifier was implemented and fabricated in a 0.35 μm CMOS technology. Experiment results show that the implemented IAC amplifier, driving a 150 pF load capacitance, achieved a gain-bandwidth product (GBW) of 4.4 MHz while dissipating only 30 μW power with a 1.5 V supply.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:46 ,  Issue: 2 )