An Energy-Efficient 3.7-nV/√ Hz Bridge-Readout IC with a Stable Bridge Offset Compensation Scheme

Conference paper (2017)

Authors

H. Jiang Electronic Instrumentation - EEMCS
K.A.A. Makinwa Microelectronics
S. Nihtianova Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Sensors Energy efficiency Logic gates Modulation Impedance Choppers (circuits) Bridge circuits
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Published Date

2017

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

Wheatstone bridge sensors are often used in precision instrumentation and measurement systems, e.g., for μK-resolution temperature sensing in wafer steppers [1] and mPa-resolution differential pressure sensing in precision air gauges [2]. Since they output small differential signals superimposed on a large common-mode (CM) voltage, typical bridge readout ICs (ROICs) consist of an instrumentation amplifier (IA) followed by an ADC [1]. This paper describes a low-noise energy-efficient ROIC, which achieves a 3.7nV/√Hz input-referred noise PSD and a power efficiency factor (PEF) of 44.1. The latter represents a 5× improvement on the state of the art [3].

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