Passive frequency compensation for high gain-bandwidth and high slew-rate two-stage OTA

Author

Mirvakili, A. ; Koomson, Valencia Joyner

Author_Institution

Adv. Integrated Circuits & Syst. Lab., Tufts Univ., Medford, MA, USA

Volume

50

Issue

9

fYear

2014

fDate

April 24 2014

Firstpage

657

Lastpage

659

Abstract

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.

Keywords

CMOS analogue integrated circuits; capacitors; compensation; operational amplifiers; resistors; CMOS process; FoM; GBW; LHP zero; bandwidth 100 MHz; figure of merit; high gain-bandwidth; high slew-rate; high slew-rate two-stage OTA design; left-hand-plane zero; multistage operational transconductance amplifier; nulling resistor; passive frequency compensation method; power 1.7 mW; series compensating capacitor; size 0.18 mum;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2014.0473

Filename

6809280