Open AccessCurrent‐reuse single Miller feedforward compensation for multi‐stage amplifiers
Author(s) -
Zhang L.,
Chang Z.,
Wang Y.,
Yu Z.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2012.3674
Subject(s) - operational amplifier , feed forward , frequency compensation , phase margin , electronic engineering , gain–bandwidth product , engineering , cmos , current feedback operational amplifier , reuse , amplifier , computer science , control theory (sociology) , electrical engineering , control engineering , control (management) , artificial intelligence , waste management
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.