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A 7 GHz ERBW 11 GSs 6-bit PVT Tolerant Asynchronous Charge-Injection SAR With On
一款6位1.1GS/s异步电荷注入SAR ADC，具有7GHz ERBW和PVT容差能力。
28nm CMOS, 0.9-1.1V, 1.1GS/s, 35.2dB SNDR, 25.5fJ/conv.-step
异步SAR ADC电荷注入PVT容差高带宽能效优化
▸电流减少的电荷注入单元(CIC)
▸基于复制的反馈环路降低PVT影响
▸共模偏移方案缓解比较器动态偏移问题
Abstract
This article presents a 6-bit 1.1 GS/s asynchronous
charge-injection SAR (ci-SAR) analog-to-digital-converter (ADC)
achieving an unprecedented area efficiency of 0.0048 [GS/s/ µm2]
per slice. A current-reduced charge injection cell (CIC)
enables a small input capacitance of 8.5 fF, which helps
extend the effective resolution bandwidth (ERBW) to 7 GHz.
A replica-based feedback loop desensitizes the full-scale vari-
ations on process, voltage, and temperature (PVT) conditions.
A common-mode shifti