Open AccessPassive frequency compensation for high gain‐bandwidth and high slew‐rate two‐stage OTA
Author(s) -
Mirvakili A.,
Koomson V.J.
Publication year - 2014
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.2014.0473
Subject(s) - slew rate , frequency compensation , bandwidth (computing) , resistor , transconductance , capacitor , figure of merit , operational transconductance amplifier , amplifier , electronic engineering , electrical engineering , power consumption , cmos , operational amplifier , power (physics) , engineering , materials science , physics , optoelectronics , telecommunications , voltage , transistor , quantum mechanics
A passive frequency compensation method is presented for the first time, which can be applied to two/multi‐stage operational transconductance amplifier (OTA) designs, to achieve high gain‐bandwidth (GBW) and high slew‐rate with no increase in the overall power consumption. A nulling resistor with series compensating capacitor is applied in the first stage and extends the GBW by introducing a left‐hand‐plane (LHP) zero. This design is implemented in a 0.18 μm CMOS process and the measured results show a GBW of 100 MHz and average SR of 60 V/μs with a power consumption of 1.7 mW. A high figure of merit (FoM) of 94.7 GHz pF V/μs/mA is achieved.