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Current-reuse single Miller feedforward compensation for multi-stage amplifiers

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4 Author(s)
Zhang, L. ; Inst. of Microelectron., Tsinghua Univ., Beijing, China ; Chang, Z. ; Wang, Y. ; Yu, Z.

Presented is a novel current-reuse single Miller feedforward compensation (CRSMFC) scheme for multi-stage operational amplifiers (opamps). The proposed scheme introduces an implicit feedforward path into an opamp by reusing the current of the input stage, which creates a left-half-plane zero to cancel out the first non-dominant pole in the transfer function, thus improving phase margin and gain bandwidth product (GBW) without extra power consumption. A three-stage opamp prototype with proposed CRSMFC is realised in standard 0.18 μm CMOS process, and measured results show that it achieves a GBW of 4.4 MHz and a phase margin of 73° while driving a large capacitive load of 250 pF with only 34 μW of power consumption, implying a superior FoM over the state-of-the-art.

Published in:

Electronics Letters  (Volume:49 ,  Issue: 2 )