A Class-AB Reference Voltage Buffer for SC Circuits in Pipelined ADCs

Zeng, Li; Wang, Ming; Yin, Rui; Gu, Yanhan; Zhang, Yuxing; Tang, Zhangwen

doi:10.3390/electronics15030547

Open AccessArticle

A Class-AB Reference Voltage Buffer for SC Circuits in Pipelined ADCs

by

Li Zeng

,

Ming Wang

,

Rui Yin

,

Yanhan Gu

,

Yuxing Zhang

and

Zhangwen Tang

^*

State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China

^*

Author to whom correspondence should be addressed.

Electronics 2026, 15(3), 547; https://doi.org/10.3390/electronics15030547

Submission received: 15 December 2025 / Revised: 21 January 2026 / Accepted: 24 January 2026 / Published: 27 January 2026

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Abstract

This paper introduces the design of a reference voltage buffer (RVB) for pipelined analog-to-digital converters (ADCs) in a 180 nm CMOS process with a 1.8 V supply voltage. The loop stability of the proposed RVB is verified by the theoretical calculations. The driving capability of the proposed RVB is demonstrated by its large driving current, and the transient response simulation results reveal its impressive speed and precision in the reference voltage settling process. Moreover, the power supply rejection ratio (PSRR) performance indicates that the proposed RVB is insensitive to the variation in power supply voltage, meeting the application requirements for high-speed and high-precision pipelined ADCs.

Keywords: reference voltage buffer; pipelined ADC; loop stability; driving capability; transient response; PSRR

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MDPI and ACS Style

Zeng, L.; Wang, M.; Yin, R.; Gu, Y.; Zhang, Y.; Tang, Z. A Class-AB Reference Voltage Buffer for SC Circuits in Pipelined ADCs. Electronics 2026, 15, 547. https://doi.org/10.3390/electronics15030547

AMA Style

Zeng L, Wang M, Yin R, Gu Y, Zhang Y, Tang Z. A Class-AB Reference Voltage Buffer for SC Circuits in Pipelined ADCs. Electronics. 2026; 15(3):547. https://doi.org/10.3390/electronics15030547

Chicago/Turabian Style

Zeng, Li, Ming Wang, Rui Yin, Yanhan Gu, Yuxing Zhang, and Zhangwen Tang. 2026. "A Class-AB Reference Voltage Buffer for SC Circuits in Pipelined ADCs" Electronics 15, no. 3: 547. https://doi.org/10.3390/electronics15030547

APA Style

Zeng, L., Wang, M., Yin, R., Gu, Y., Zhang, Y., & Tang, Z. (2026). A Class-AB Reference Voltage Buffer for SC Circuits in Pipelined ADCs. Electronics, 15(3), 547. https://doi.org/10.3390/electronics15030547

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A Class-AB Reference Voltage Buffer for SC Circuits in Pipelined ADCs

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