一种被动传输剩余电压的高速SAR ADC

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关键词： 逐次逼近型模数转换器；二步式ADC；剩余电压；电容分裂CDAC；动态比较器

中图分类号： TN792

文献标识码：A

DOI：10.14106/j.cnki.1001-2028.2025.1422

引用格式：李新， 王扬， 杨森林. 一种被动传输剩余电压的高速SAR ADC [J]. 电子元件与材料， 2025， 44（3）： 278-284.

Reference format： LI Xin， WANG Yang， YANG Senlin. A high speed SAR ADC based on passive residual-voltage transmission [J]. Electronic Components and Materials， 2025， 44（3）： 278-284.

A high speed SAR ADC based on passive residual-voltage transmission

LI Xin 1， WANG Yang 1， YANG Senlin 2

（1.School of Information Science and Engineering，Shenyang University of Technology， Shenyang 110870，China;

2.Shenzhixin Microelectronics （Shanghai） Co.， Ltd.， Shanghai 201203， China）

Abstract： To address the bandwidth and mismatch problems caused by residual amplifiers in traditional two-step successive approximation analog-to-digital converters （SAR ADC）， an 8 bit_450 MSPs high-speed two-step SAR ADC with passive residual-voltage transmission was proposed. The first-stage analog-to-digital converter （ADC） transmits the residual signal directly to the second-stage ADC without attenuation during the coarse conversion of the signal. Therefore， the use of residual amplifiers was avoided. The time and power consumption， which were caused by the traditional two-step structure to amplify the residual signal， were reduced. And the bandwidth mismatch caused by the residual amplifier mismatch was avoided， too. The continuity of the circuit was ensured by using two second-stage sub-ADCs working in ping-pong mode. As for Sub-ADCs， capacitor-split capacitor-integer digital-to-analog converter （CDAC） and multi-comparator architecture were used to further increase the conversion speed. Based on 40 nm BCD and 1.1 V supply voltage， the ADC achieves a sample rate of 450 MSPs， a signal-to-noise ratio（SNR） of 51.8 dB， a signal-to-noise distortion ratio（SNDR） of 46.5 dB， a spurious-free dynamic range（SFDR） of 59.8 dB and a power consumption of 2.44 mW.

Keywords： successive approximation analog-to-digital converter; two-step ADC; residual voltage; capacitor splitting CDAC; dynamic comparator

在现代通信系统，尤其在超宽带无线通信、高速串口通信和宽带宽以太网收发器等领域中，具有中等精度和高转换速率的模数转换器有很高的应用价值 [1]。（剩余8909字）