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Article

A 12-bit 40-MS/s SAR ADC with Calibration-Less Switched Capacitive Reference Driver

The School of Electrical and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
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Electronics 2020, 9(11), 1854; https://doi.org/10.3390/electronics9111854
Received: 12 October 2020 / Revised: 1 November 2020 / Accepted: 3 November 2020 / Published: 5 November 2020
(This article belongs to the Special Issue Advances on Analog-to-Digital and Digital-to-Analog Converters)
This paper presents a switched capacitive reference driver (SCRD) with a low-energy switching scheme. In order to reduce the performance degradation resulting from a signal-dependent voltage drop in a capacitive reference driver (CRD) without increasing the capacitance (CREF) of a CRD, the proposed SCRD utilizes the CRD for LSB conversion cycles. In MSB conversion cycles, a supply voltage is used as a reference voltage to save on area and power consumption. As such, the proposed SCRD significantly relaxes the required CREF, and does not necessitate bit weight calibration or compensation requiring an auxiliary capacitor-based digital-to-analog converter (CDAC). To evaluate the proposed SCRD, a prototype 12-bit 40-MS/s SAR ADC is fabricated in a 65 nm CMOS process. With near Nyquist frequency, the measured spurious-free dynamic range (SFDR) of the SAR ADC with the SCRD is 80.6 dB, which is about a 16 dB improvement from the SFDR of a SAR ADC with a CRD only. View Full-Text
Keywords: capacitive reference driver; MOS capacitor; SAR ADC; signal-dependent error; switching energy capacitive reference driver; MOS capacitor; SAR ADC; signal-dependent error; switching energy
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MDPI and ACS Style

Ju, H.; Lee, S.; Lee, M. A 12-bit 40-MS/s SAR ADC with Calibration-Less Switched Capacitive Reference Driver. Electronics 2020, 9, 1854. https://doi.org/10.3390/electronics9111854

AMA Style

Ju H, Lee S, Lee M. A 12-bit 40-MS/s SAR ADC with Calibration-Less Switched Capacitive Reference Driver. Electronics. 2020; 9(11):1854. https://doi.org/10.3390/electronics9111854

Chicago/Turabian Style

Ju, Hyungyu, Sewon Lee, and Minjae Lee. 2020. "A 12-bit 40-MS/s SAR ADC with Calibration-Less Switched Capacitive Reference Driver" Electronics 9, no. 11: 1854. https://doi.org/10.3390/electronics9111854

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