A Low Distortion CMOS Bootstrapped Switch

Author

Qian, Libo ; Zhu, Zhangming ; Yang, Yintang

Author_Institution

Inst. of Microelectron., Xidian Univ., Xi´´an, China

fYear

2009

fDate

16-17 May 2009

Firstpage

261

Lastpage

264

Abstract

This paper presents a novel low distortion CMOS bootstrapped switch that adopts a "source track" technique to track the real source terminal of the sampling switch. This technique improves nonlinear distortion due to variation of the gate overdrive and the threshold voltage in conventional switches, acquiring a precise sampling of signal. Based on the SMIC 0.18 mum standard CMOS process, the proposed switch has been simulated at 200 MSPS. The simulation results show the spurious-free dynamic range (SFDR) is 73.6 dB and total harmonic distortion (THD) is -79.8 dB.

Keywords

CMOS analogue integrated circuits; MOSFET; analogue-digital conversion; bootstrap circuits; field effect transistor switches; harmonic distortion; NMOS transistor; PMOS transistor; SMIC standard CMOS process; analog-digital converters; gate overdrive; low distortion CMOS bootstrapped switch; nonlinear distortion; sampling switch; source terminal; source track technique; spurious-free dynamic range; threshold voltage; total harmonic distortion; CMOS technology; Clocks; MOS devices; MOSFETs; Nonlinear distortion; Sampling methods; Signal sampling; Switches; Switching circuits; Threshold voltage; component; gate-source bootstrap; nonlinear distortion; sampling switch (keywords); source track;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits, Communications and Systems, 2009. PACCS '09. Pacific-Asia Conference on

Conference_Location

Chengdu

Print_ISBN

978-0-7695-3614-9

Type

conf

DOI

10.1109/PACCS.2009.97

Filename

5232336