Attenuation‐factor error shaping technique for split CDAC in SAR ADCs. Issue 8 (1st April 2020)

• Record Type: Journal Article
• Authors: Sun, Jie; Li, Xin; Yan, Chenggang; Liu, Weiqiang
• Is Part Of: Electronics letters. Volume 56:Issue 8(2020)
• Page Start: 369
• Page End: 371
• Publication Date: 2020-04-01
• Subjects: digital‐analogue conversion -- capacitors -- analogue‐digital conversion -- flip‐flops -- electromagnetic wave attenuation; split CDAC -- SAR ADC -- split capacitor‐digital‐to‐analogue converter -- successive‐approximation‐register ADC -- inaccurate attenuation‐factor error -- attenuation‐factor shaping technique -- parasitic components -- in‐band dynamic performance -- spurious‐free‐dynamic‐range -- least significant bit; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2019.4044
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A shaping technique is proposed to remedy the attenuation‐factor error in the split capacitor‐digital‐to‐analogue converter (CDAC) of a successive‐approximation‐register (SAR) ADC. By feeding back the previous quantised value of the least significant bit part to the most significant bit part, the inaccurate attenuation‐factor error caused by mismatches and parasitic components is shaped to high frequency. The in‐band dynamic performance is significantly improved without any calibration. Simulation results show that the proposed attenuation‐factor shaping technique improves the spurious‐free‐dynamic‐range by 10 dB, whereas the number of capacitors increases only 1.2%.