A low-noise multipath operational amplifier with Gm-shared ping-pong and ripple averaging techniques

IF 1.9 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Microelectronics Journal Pub Date : 2024-07-17 DOI:10.1016/j.mejo.2024.106306

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Abstract

This paper presents a low-noise chopper-stabilized multipath operational amplifier with transconductance (G_m) sharing technique between ping-pong stages and ripple averaging technique. While the chopper stabilization is effective in reducing low-frequency noise and offset, output signals may yet contain ripples caused by the modulated amplifier offset. Several schemes can be implemented to suppress these output ripples; however, they require additional chip area and current consumption. The proposed ripple averaging technique effectively eliminates chopper ripples with very low additional power consumption of switched capacitors. To reduce the power consumption and circuit area, the G_m-shared ping-pong scheme is also proposed. The proposed circuit was implemented using a 0.18-μm CMOS process, with a total current consumption of 121.91 μA, and a supply voltage of 1.8 V. It occupies a chip area of 0.33 mm² and exhibits an input-referred offset of 4.833 μV with a standard deviation 0.861 μV. The proposed amplifier has the input-referred noise level of 20.1 nV/√Hz.

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采用 G 共享乒乓和纹波平均技术的低噪声多路径运算放大器

本文介绍了一种低噪声斩波稳定多路径运算放大器，它采用了乒乓级之间的跨导（Gm）共享技术和纹波平均技术。虽然斩波稳定技术能有效降低低频噪声和偏移，但输出信号仍可能包含由调制放大器偏移引起的纹波。可以采用几种方案来抑制这些输出纹波，但这些方案需要额外的芯片面积和电流消耗。所提出的纹波平均技术能有效消除斩波纹波，而且开关电容器的额外功耗非常低。为了减少功耗和电路面积，还提出了 Gm 共享乒乓方案。该电路采用 0.18μm CMOS 工艺实现，总电流消耗为 121.91 μA，电源电压为 1.8 V，芯片面积为 0.33 mm2，输入参考偏移为 4.833 μV，标准偏差为 0.861 μV。拟议放大器的输入参考噪声水平为 20.1 nV/√Hz。

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来源期刊

Microelectronics Journal 工程技术-工程：电子与电气

CiteScore

4.00

自引率

27.30%

发文量

222

审稿时长

43 days

期刊介绍： Published since 1969, the Microelectronics Journal is an international forum for the dissemination of research and applications of microelectronic systems, circuits, and emerging technologies. Papers published in the Microelectronics Journal have undergone peer review to ensure originality, relevance, and timeliness. The journal thus provides a worldwide, regular, and comprehensive update on microelectronic circuits and systems. The Microelectronics Journal invites papers describing significant research and applications in all of the areas listed below. Comprehensive review/survey papers covering recent developments will also be considered. The Microelectronics Journal covers circuits and systems. This topic includes but is not limited to: Analog, digital, mixed, and RF circuits and related design methodologies; Logic, architectural, and system level synthesis; Testing, design for testability, built-in self-test; Area, power, and thermal analysis and design; Mixed-domain simulation and design; Embedded systems; Non-von Neumann computing and related technologies and circuits; Design and test of high complexity systems integration; SoC, NoC, SIP, and NIP design and test; 3-D integration design and analysis; Emerging device technologies and circuits, such as FinFETs, SETs, spintronics, SFQ, MTJ, etc. Application aspects such as signal and image processing including circuits for cryptography, sensors, and actuators including sensor networks, reliability and quality issues, and economic models are also welcome.