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Study of a High-Precision Read-Out Integrated Circuit for Bridge Sensors.

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Summary

This study presents a high-precision, low-power sigma-delta analog-to-digital converter (ADC) for sensor applications. The designed circuit achieves an 118 dB dynamic range and 110.5 dB signal-to-noise ratio, meeting demanding requirements.

Keywords:
digital filterhigh precisionread-out circuitssigma-delta modulator

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Integrated Circuit Design

Background:

  • Bridge sensors and digital sensors are crucial in military and civilian applications.
  • High-precision, low-power analog-to-digital converters (ADCs) are essential for sensor readout circuits.
  • Sigma-delta ADCs offer high signal-to-noise ratio (SNR), linearity, and CMOS compatibility.

Purpose of the Study:

  • To design and implement a fourth-order feed-forward sigma-delta modulator with a digital decimation filter.
  • To enhance system stability and suppress noise using correlated double sampling (CDS) and an active pre-compensator.
  • To achieve high precision and low power consumption for sensor applications.

Main Methods:

  • Designed a fourth-order feed-forward sigma-delta modulator and a digital decimation filter.
  • Employed correlated double sampling (CDS) to reduce pre-integrator noise.
  • Utilized an active pre-compensator for stability and an adjustable feedback factor for process error compensation.

Main Results:

  • Fabricated a chip using a 0.35 μm CMOS process with a 9 mm² area.
  • Achieved a modulator power consumption of 13 mW at 5 V supply and 6.144 MHz sampling frequency.
  • Demonstrated a 118 dB dynamic range, 110.5 dB SNR (at 24 kHz bandwidth), 18.05 effective bits, and -113 dB harmonic distortion.

Conclusions:

  • The designed sigma-delta ADC meets the stringent requirements for high-precision sensor applications.
  • The implemented circuit offers a competitive balance of performance, power consumption, and area.
  • The techniques used, including CDS and active pre-compensation, are effective for improving sigma-delta modulator performance.