Open AccessPower‐efficient class AB fully differential amplifier
Author(s) -
Saso J.M.,
LopezMartin A.J.,
Garde M.P.,
RamirezAngulo J.
Publication year - 2017
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.2070
Subject(s) - fully differential amplifier , slew rate , direct coupled amplifier , biasing , operational transconductance amplifier , amplifier , electronic engineering , rf power amplifier , linearity , gain–bandwidth product , differential amplifier , computer science , cmos , operational amplifier , electrical engineering , voltage , engineering
A class AB one‐stage fully differential amplifier is described. It includes adaptive biasing techniques to the conventional class A differential amplifier that improve linearity, gain‐bandwidth product and slew rate, maintaining the same DC bias currents and supply voltage requirements. Boosting of dynamic currents for large input signals takes place at the output branches, without internal replication of these currents. This leads to a nearly 100% current efficiency. Measurement results for a 0.5 μm CMOS test chip prototype validate the proposal.