Romanian Journal of Information Science and Technology (ROMJIST)

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:

Academician Dan Dascalu

Secretariate (office):
Adriana Apostol
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsors:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro
• Association for Generic
and Industrial Technologies (ASTEGI), www.astegi.ro

ROMJIST Volume 24, No. 2, 2021, pp. 182-200, Paper no. 687/2021
 

Adrian Constantin VESELU, Cornel STĂNESCU, Gheorghe BREZEANU
New Constant-gm circuit for precision chopper offset-stabilized operational amplifiers

ABSTRACT: The paper presents a low-voltage chopper offset-stabilized operational amplifier with a new constant-gm technique, having a 1.8-5.5 V supply range, designed and simulated in a 0.25 µm CMOS process. The amplifier has an offset voltage of ±5 µV, minimum CMRR of 106 dB, minimum PSRR of 121 dB, 51 nV/√Hz voltage noise density and 550 kHz unity-gain bandwidth. The quiescent current is only 36 µA and was obtained due to the new low current constant-gm technique, which provides a variation of only 4% of the input transconductance and almost constant unity-gain bandwidth within the common-mode voltage range.

KEYWORDS: Microelectronics and electronic packaging, chopper offset-stabilized operational amplifier, constant-gm, low current, offset voltage, noise

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