A low-distortion CMOS analogue voltage follower for high-speed ADCs

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• 作者：Yintang Yang ; Liang Zhang ; Zhangming Zhu ; ^{zhangmingzhu@xidian.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ruixue Ding
• 关键词：Voltage follower ; Source follower ; High-speed ADC ; Quasi-floating bulk ; Body effect cancellation
• 刊名：Microelectronics Journal
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：54
• 期：Complete
• 页码：67-71
• 全文大小：800 K

文摘

This paper presents a low-distortion CMOS analogue voltage follower for high-speed medium-bit analog-to-digital converters (ADCs). The improved circuit is based on a wideband fully differential source-follower configuration. To eliminate the channel length modulation, lower-threshold cascode transistors are adopted. Furthermore, the body effect is removed by quasi-floating bulk (QFB) technique. Therefore, the linearity of the proposed source follower is superior to the conventional ones. The improved circuit has been designed and simulated by SPECTRE with a standard BSIM4 65 nm CMOS technology. It achieves over 68 dB spurious free dynamic range (SFDR) with a 1.2 V_pp 1 GHz differential sinusoid input signal. The circuit consumes 2.6 mW with a 1.8 V power supply.