Abstract

Numerous non-ideal effects can distort the functionality of sensor interfaces and have to be considered during the design phase. In order to relax the requirements for the analog circuit components, adaptive filtering and digital calibration are used in this work to detect and correct different gain- and offset-errors. The error detection is performed by transmitting a test signal through the sensor interface continuously and in parallel to the sensor signal. In the digital domain, variations of the test signal are evaluated and present errors can be determined and eliminated. In this way, an on-line error correction is realized, which makes the sensor interface more robust against static and dynamic non-idealities. The proposed concept is demonstrated by correcting different gain- and offset-errors in a 65nm CMOS sensor interface.

Highlights

  • The precise measurement of physical quantities is required in numerous safety-critical applications and performed by highly accurate sensor interface circuits

  • A novel concept based on digital calibration is used in this work to integrate an on-line error correction into a sensor interface

  • The error in the output signal of the sensor interface is illustrated in Figure 7 with and without error correction

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Summary

Introduction

The precise measurement of physical quantities is required in numerous safety-critical applications and performed by highly accurate sensor interface circuits. Mismatch- and offset-errors can be suppressed by complex circuit topologies, different design techniques or additional components [1,2], influences from process variation, varying temperature or varying supply voltage (PVT influences) can be conquered by a complementary circuit design or special layout techniques [3,4]. All of these methods significantly increase the design time and costs of the interface.

Sensor Interface Circuit
On-Line Error Correction by Adaptive Filtering
Simulation Results
Conclusions
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