A low-distortion CMOS analogue voltage follower for high-speed ADCs. (August 2016)

• Record Type: Journal Article
• Authors: Yang, Yintang; Zhang, Liang; Zhu, Zhangming; Ding, Ruixue
• Is Part Of: Microelectronics journal. Volume 54(2016)
• Page Start: 67
• Page End: 71
• Publication Date: 2016-08
• Subjects: Voltage follower -- Source follower -- High-speed ADC -- Quasi-floating bulk -- Body effect cancellation; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2016.05.011
• Languages: English
• ISSNs: 0959-8324

Abstract

Abstract: 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 Vpp 1 GHz differential sinusoid input signal. The circuit consumes 2.6 mW with a 1.8 V power supply.