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access icon free Current-reuse single Miller feedforward compensation for multi-stage amplifiers

© The Institution of Engineering and Technology
Received 20/10/2012, Published

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.

Inspec keywords: transfer functions; operational amplifiers; CMOS analogue integrated circuits; feedforward amplifiers; poles and zeros

Other keywords: transfer function; implicit feedforward path; phase margin; power 34 muW; left-half-plane zero; nondominant pole; size 0.18 mum; current-reuse single Miller feedforward compensation; three-stage opamp prototype; CMOS process; capacitance 250 pF; multistage operational amplifiers; bandwidth 4.4 MHz; gain bandwidth product; power consumption

Subjects: CMOS integrated circuits; General circuit analysis and synthesis methods; Amplifiers

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