Title :
A Low Distortion CMOS Bootstrapped Switch
Author :
Qian, Libo ; Zhu, Zhangming ; Yang, Yintang
Author_Institution :
Inst. of Microelectron., Xidian Univ., Xi´´an, China
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;
Conference_Titel :
Circuits, Communications and Systems, 2009. PACCS '09. Pacific-Asia Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-0-7695-3614-9
DOI :
10.1109/PACCS.2009.97
