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2022•Unpublished venueRequires access

Design and Implementation of A High-Precision Low-Power Instrumentation Amplifier

Xueting Zhao, Xinpeng Xing, Gaofeng Luan, Zhengzhong Wu, Zhihua Wang

Open publisher page 4 citations

Abstract

This paper presents a high-precision and low-power two-stage miller-compensated instrumentation amplifier for sensor readout circuits. Folded-cascode structure with complementary input differential pairs and translinear-loop-based class AB circuit are adopted as the amplifier first and second stages respectively, to achieve rail-to-rail input and output ranges. The presented instrumentation amplifier is implemented in a 0.18μm BCD technology. Measurement results show that with a load of 100pF and 100kΩ, the presented amplifier achieves 79. 79dB gain, 1. 35MHz gain-bandwidth product (GBW) and 92. 3dB power supply rejection ratio (PSRR). The measured amplifier gain error is 0.11%; and its input offset voltage is 0. 3mV. This amplifier totally consumes 0. 19mW power from a 3V supply voltage.

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What this paper is about

This paper presents a high-precision and low-power two-stage miller-compensated instrumentation amplifier for sensor readout circuits. Folded-cascode structure with complementary input differential pairs and translinear-loop-based class AB circuit are adopted as the amplifier first and second stages respectively, to achieve rail-to-rail input and output ranges. The presented instrumentation amplifier is implemented in a 0.18μm BCD technology. Measurement results show that with a load of 100pF and 100kΩ, the presented amplifier achieves 79. 79dB gain, 1. 35MHz gain-bandwidth product (GBW) and 92. 3dB power supply rejection ratio (PSRR). The measured amplifier gain error is 0.11%; and its input offset voltage is 0. 3mV. This amplifier totally consumes 0. 19mW power from a 3V supply voltage.

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Available abstract

This paper presents a high-precision and low-power two-stage miller-compensated instrumentation amplifier for sensor readout circuits. Folded-cascode structure with complementary input differential pairs and translinear-loop-based class AB circuit are adopted as the amplifier first and second stages respectively, to achieve rail-to-rail input and output ranges. The presented instrumentation amplifier is implemented in a 0.18μm BCD technology. Measurement results show that with a load of 100pF and 100kΩ, the presented amplifier achieves 79. 79dB gain, 1. 35MHz gain-bandwidth product (GBW) and 92. 3dB power supply rejection ratio (PSRR). The measured amplifier gain error is 0.11%; and its input offset voltage is 0. 3mV. This amplifier totally consumes 0. 19mW power from a 3V supply voltage.

Key concepts: Power supply rejection ratio, Instrumentation amplifier, Direct-coupled amplifier, Operational transconductance amplifier, Fully differential amplifier, Operational amplifier, RF power amplifier, Input offset voltage

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