Analogue circuit design methodology using self-cascode structures

Author

Baek, Ki-Ju ; Gim, J.-M. ; Kim, Hyun-Suk ; Na, Kee-Yeol ; Kim, Nam-Soo ; Kim, Young-Sik

Author_Institution

Dept. of Semicond. Eng., Chungbuk Nat. Univ., Cheongju, South Korea

Volume

49

Issue

9

fYear

2013

fDate

April 25 2013

Firstpage

591

Lastpage

592

Abstract

A new analogue circuit design methodology using independently optimised self-cascode (SC) structures is proposed. Based on the concept of the dual-workfunction-gate structures, which are equivalent to SC structures, transconductance and output resistance optimised SC MOSFETs were used in the differential input and output stages, respectively. An operational amplifier (opamp) with the proposed design methodology using standard 0.18 μm CMOS technology was designed to provide better performance. The measured DC gain of the fabricated opamp with independently-optimised SC MOSFETs was approximately 12 dB higher than that of the conventional opamp.

Keywords

CMOS analogue integrated circuits; MOSFET; integrated circuit design; operational amplifiers; analogue circuit design methodology; differential input stages; differential output stages; independently-optimised SC MOSFET; opamp; operational amplifier; output resistance; self-cascode structures; size 0.18 mum; standard CMOS technology; transconductance;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2013.0554

Filename

6528110