Design of 12-bit 4 MS/s SAR ADC based on 40nm process

Bin Zhu; Shoujun Yang; Haijun Lin; Junlong Chen

doi:10.1117/12.3023379

1 April 2024 Design of 12-bit 4 MS/s SAR ADC based on 40nm process

Bin Zhu, Shoujun Yang, Haijun Lin, Junlong Chen

Proceedings Volume 12987, Third International Conference on Computer Technology, Information Engineering, and Electron Materials (CTIEEM 2023); 1298703 (2024) https://doi.org/10.1117/12.3023379
Event: Third International Conference on Computer Technology, Information Engineering, and Electron Materials (CTIEEM 2023), 2023, Zhengzhou, China

Abstract

This paper presents the design of a 12-bit 4 MS/s successive approximation register (SAR) analog-to-digital converter (ADC) based on the 40nm CMOS process. The internal structure of the ADC employs an "8MSB+4LSB" hybrid capacitive-resistive structure in the digital-to-analog converter (DAC) design to reduce layout area. The comparator circuit utilizes a dynamic comparator structure consisting of a cascade of three pre-amplifiers and a single latch, with output offset storage used to minimize comparator offset voltage. The layout design is symmetric to enhance device matching. In post-simulation under the conditions of 1.1 V analog voltage, a 941.40625 KHz input sine wave signal, and a 4 MHz sampling clock, the SAR ADC achieved an effective number of bits (ENOB) is 11.88 bits, a signal to noise and distortion ratio (SNDR) is 73.2941 dB, a spurious-free dynamic range (SFDR) is 89.4 dB, a power consumption is 1.18 mW, and a figure-of-merit (FoM) is 168.6 dB.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Bin Zhu, Shoujun Yang, Haijun Lin, and Junlong Chen "Design of 12-bit 4 MS/s SAR ADC based on 40nm process", Proc. SPIE 12987, Third International Conference on Computer Technology, Information Engineering, and Electron Materials (CTIEEM 2023), 1298703 (1 April 2024); https://doi.org/10.1117/12.3023379

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KEYWORDS

Analog to digital converters

Synthetic aperture radar

Design

Capacitors

Circuit switching

Calibration

Monte Carlo methods

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