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System design of a low noise, low offset instrumentation amplifier with chopper stabilization

Lu Zhang, Zhaohui Liu, Lenian He

Open publisher page 6 citations

Abstract

A low noise, low offset instrumentation amplifier with chopper stabilization is presented. The equivalent input noise and offset is reduced using the technique of chopper stabilization with a chopping frequency of 100 kHz. The channel charge injection is cancelled by the symmetrical circuit topology. With the wide swing bias circuit design, the amplifier achieves a very high power-supply-rejection ratio (PSRR), and it is operated at a single supply voltage of 5 V. The instrumentation amplifier is simulated using TSMC 0.35-mum CMOS technology. It achieves an input-referred noise voltage of 345nV/ radicHz @ about 1 kHz, which is not very good for muV level signal processing because of the large thermal noise parameter of the process model.

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What this paper is about

A low noise, low offset instrumentation amplifier with chopper stabilization is presented. The equivalent input noise and offset is reduced using the technique of chopper stabilization with a chopping frequency of 100 kHz. The channel charge injection is cancelled by the symmetrical circuit topology. With the wide swing bias circuit design, the amplifier achieves a very high power-supply-rejection ratio (PSRR), and it is operated at a single supply voltage of 5 V. The instrumentation amplifier is simulated using TSMC 0.35-mum CMOS technology. It achieves an input-referred noise voltage of 345nV/ radicHz @ about 1 kHz, which is not very good for muV level signal processing because of the large thermal noise parameter of the process model.

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Available abstract

A low noise, low offset instrumentation amplifier with chopper stabilization is presented. The equivalent input noise and offset is reduced using the technique of chopper stabilization with a chopping frequency of 100 kHz. The channel charge injection is cancelled by the symmetrical circuit topology. With the wide swing bias circuit design, the amplifier achieves a very high power-supply-rejection ratio (PSRR), and it is operated at a single supply voltage of 5 V. The instrumentation amplifier is simulated using TSMC 0.35-mum CMOS technology. It achieves an input-referred noise voltage of 345nV/ radicHz @ about 1 kHz, which is not very good for muV level signal processing because of the large thermal noise parameter of the process model.

Key concepts: Chopper, Instrumentation amplifier, Input offset voltage, Power supply rejection ratio, Electrical engineering, CMOS, Electronic engineering, Effective input noise temperature

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