Zero-Drift Fully Differential Amplifier With Ping-Pong Auto-Zero Stabilization and Digitally-Assisted Coarse Automatic Offset Calibration

IF 4 2区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Mookyoung Yoo;Hyeoktae Son;Kyounghwan Kim;Jihyang Wi;Gibae Nam;Minhyoek Son;Manhyoek Choi;Hyoungho Ko
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Abstract

This brief presents a ping-pong auto-zero (AZ) stabilized multipath fully differential amplifier with a digitally-assisted coarse automatic offset calibration loop. The low-frequency path (LFP) of the multipath amplifier is implemented using ping-pong AZ amplifiers. The continuous-time offset cancellation and the frequency compensation can be obtained with ping-pong AZ scheme. The digitally-assisted automatic offset calibration loops (AOCL) in the LFP and the HFP (high-frequency path) using successive approximation registers (SAR) binary search circuits and current-mode digital-to-analog converters (DAC) can effectively reduce the offsets under large process variations. The AOCL can prevent the output saturation of AZ LFP at zeroing phase, can allow the higher transconductance of the AZ LFP. The higher gain of the AZ LFP can attenuate the low frequency noise of HFP, and the lower overall input referred noise can be achieved. The circuit was fabricated using a 180 nm complementary metal-oxide-semiconductor (CMOS) process and draws $59.9~\mu $ A at a supply voltage of 1.8V. The input referred noise is 19.8 nV/ $\surd $ Hz. The power-up time is $2.3~\mu $ s. The maximum input referred offsets before and after AOCL operation are reduced from $- 740~\mu $ V to −276 nV. The unit gain-bandwidth is 3.042 MHz. The power supply rejection ratio (PSRR) and common mode rejection ratio (CMRR) are 111 dB, and 99 dB, respectively.
零漂移全差分放大器与乒乓自动零稳定和数字辅助粗自动偏移校准
本文介绍了一种带有数字辅助粗自动偏置校准环路的乒乓自动归零(AZ)稳定多径全差分放大器。多径放大器的低频路径(LFP)采用乒乓型AZ放大器实现。乒乓空区方案可实现连续时间偏移抵消和频率补偿。LFP和HFP(高频路径)中的数字辅助自动偏置校准环路(AOCL)采用逐次逼近寄存器(SAR)、二进制搜索电路和电流模数模转换器(DAC),可以有效地减少大工艺变化下的偏置。AOCL可以防止azlfp在归零相位的输出饱和,允许azlfp具有更高的跨导性。高增益的AZ LFP可以衰减HFP的低频噪声,从而实现较低的整体输入参考噪声。该电路采用180 nm互补金属氧化物半导体(CMOS)工艺制作,在1.8V电源电压下输出电流为59.9~\mu $ a。输入参考噪声为19.8 nV/ $ $ $ Hz。上电时间为$2.3~\mu $ s, AOCL操作前后的最大输入参考偏置从$- 740~\mu $ V减小到- 276 nV,单位增益带宽为3.042 MHz。电源抑制比(PSRR)为111 dB,共模抑制比(CMRR)为99 dB。
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来源期刊
IEEE Transactions on Circuits and Systems II: Express Briefs
IEEE Transactions on Circuits and Systems II: Express Briefs 工程技术-工程:电子与电气
CiteScore
7.90
自引率
20.50%
发文量
883
审稿时长
3.0 months
期刊介绍: TCAS II publishes brief papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: Circuits: Analog, Digital and Mixed Signal Circuits and Systems Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic Circuits and Systems, Power Electronics and Systems Software for Analog-and-Logic Circuits and Systems Control aspects of Circuits and Systems.
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