Loading web-font TeX/Main/Regular
A 13-bit 8-kS/s -–- Readout IC Using ZCB Integrators With an Embedded Resistive Sensor Achieving 1.05-pJ/Conversion Step and a 65-dB PSRR | IEEE Journals & Magazine | IEEE Xplore

A 13-bit 8-kS/s \Delta\Sigma Readout IC Using ZCB Integrators With an Embedded Resistive Sensor Achieving 1.05-pJ/Conversion Step and a 65-dB PSRR


Abstract:

This paper reports on an energy-efficient Δ-Σ readout IC (ROIC) with a high power-supply-rejection ratio (PSRR). The static power consumption is minimized by applying a z...Show More

Abstract:

This paper reports on an energy-efficient Δ-Σ readout IC (ROIC) with a high power-supply-rejection ratio (PSRR). The static power consumption is minimized by applying a zero-crossing-based (ZCB) circuit to implement switched-capacitor (SC) integrators, while the resistive sensor is embedded inside the circuit to reuse the bias current. Oversampling Δ-Σ modulation also directly provides the digitized output, avoiding the need for a power-hungry instrumentation amplifier while preserving the linear settling behavior of the ZCB SC integrators. A dual-path bridge measurement aids in upholding PSRR of ROIC against bridge imbalance. Prototyped in 0.18-μm CMOS, the dual-path ROIC for the bridge measurement shows a nonlinearity of c400 ppm and an rms-noise-equivalent resolution of 13 bits at a conversion rate of 8 kS/s, corresponding to a figure of merit of 1.05-pJ/conversion step. The achieved noise-frequencyindependent PSRR is 65 dB, and the supply and temperature sensitivities are 0.23%/V and 55 ppm/°C, respectively.
Page(s): 843 - 853
Date of Publication: 13 February 2019

ISSN Information:

Funding Agency:


References

References is not available for this document.