Comparator-based switched-capacitor pipelined ADC with background offset calibration

Jang, Jaeduck

doi:10.1109/iscas.2011.5937549

Cited by 6 publications

(1 citation statement)

References 10 publications

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“…Recently, several techniques have been developed to alleviate the finite gain error of op-amps in SC circuits, such as comparator-based SC (CBSC) circuits [11,12], digital circuits-based SC circuits, which are also called zero-crossing-detectors-based (ZCD) SC circuits [13][14][15] and digital calibration algorithms [16][17][18]. However, CBSC circuits introduce large offset errors and linearity problems due to the output overshoots and voltage drop on switches [19]. Furthermore, these digital techniques are more complicated than switched-capacitor techniques, which have been proposed to increase the effective gain of op-amps, such as correlated level shifting (CLS) [20], cross-coupling CLS [21], sequential-CLS [22], charge-compensated CLS [23], and averaging-CLS [24].…”

Section: Introductionmentioning

confidence: 99%

A Novel Offset and Finite-Gain Compensated Switched-Capacitor Amplifier with Input Correlated Level Shifting

Chen

Guo³

et al. 2019

Electronics

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A novel offset and finite-gain compensated differential switched-capacitor(SC) amplifier is presented. Incorporating the correlated double sampling (CDS) technique and input correlated level shifting (CLS) technique together, the DC offset and DC gain error of SC amplifier are further reduced by a factor of op-amp DC gain compared with the conventional offset and finite-gain compensated SC amplifier. The effectiveness of the new scheme has been analyzed and verified by extensive simulations. An SC amplifier with the proposed scheme is designed in 130 nm CMOS technology. Simulated results show that with an op-amp having a low DC gain of 30 dB and an input offset of 10 mV, the proposed SC amplifier achieves an output offset and DC-gain error of 154 µV and 0.05%, respectively, which are significantly improved compared with 1.155 mV and 0.42% achieved in the conventional SC amplifier.

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