Analysis and Design of Low-Distortion CMOS Source Followers

Author

Fan, Xianping ; Chan, P.K.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

Volume

52

Issue

8

fYear

2005

Firstpage

1489

Lastpage

1501

Abstract

This paper presents the analysis of CMOS technology based nMOS source follower (NSF), pMOS source follower (PSF), and cascade-complementary source follower(CCSF) using a simplified large-signal model. Three new large-signal second harmonic equations and high-frequency transfer functions are derived. Optimization strategies which permit optimal design for low-distortion NSF, PSF, and CCSF are proposed. This includes a new complementary linearization method introduced for CCSF. With employment of dedicated optimization, the CCSF can achieve significantly better low-distortion broad-band characteristics than the other schemes. Comparative HSPICE simulated results for the three source followers have shown good agreement with the second-order analytical results using the simplified BSIM3 model equations.

Keywords

CMOS integrated circuits; circuit optimisation; harmonic distortion; integrated circuit design; linearisation techniques; transfer functions; CMOS integrated circuits; cascade-complementary source follower; circuit optimisation; complementary linearization method; harmonic distortion; high-frequency transfer functions; integrated circuit design; large-signal second harmonic equations; linearisation techniques; low-distortion CMOS source followers; nMOS source follower; pMOS source follower; CMOS technology; Circuits; Equations; Frequency; Harmonic analysis; Harmonic distortion; Linearity; MOS devices; Semiconductor device modeling; Transfer functions; Buffer; CMOS circuit; harmonic distortion; large-signal model; linearization; source follower;

fLanguage

English

Journal_Title

Circuits and Systems I: Regular Papers, IEEE Transactions on

Publisher

ieee

ISSN

1549-8328

Type

jour

DOI

10.1109/TCSI.2005.851711

Filename

1495715