Print Email Facebook Twitter An Energy-Efficient 3.7-nV/√ Hz Bridge Readout IC With a Stable Bridge Offset Compensation Scheme Title An Energy-Efficient 3.7-nV/√ Hz Bridge Readout IC With a Stable Bridge Offset Compensation Scheme Author Jiang, H. (TU Delft Electronic Instrumentation) Nihtianova, S. (TU Delft Electronic Instrumentation) Makinwa, K.A.A. (TU Delft Microelectronics) Department Microelectronics Date 2019 Abstract This paper describes an energy-efficient bridge readout IC (ROIC), which consists of a capacitively coupled instrumentation amplifier (CCIA) that drives a continuous-time delta–sigma modulator (CTM). By exploiting the CCIA’s abilityto block dc common-mode voltages, the bridge’s bias voltage may exceed the ROIC’s supply voltage, allowing these voltages to be independently optimized. Since bridge output is typically much smaller than bridge offset, a digital to analog converter (DAC) is used to compensate this offset before amplification andthus increase the CCIA’s useful dynamic range. Bridge loading is reduced by using a dual-path positive feedback scheme to boost the CCIA’s input impedance. Furthermore, the CCIA’s output is gated to avoid digitizing its output spikes, which would otherwise limit the ROIC’s linearity and stability. The ROIC achieves an input-referred noise density of 3.7 nV/Hz, a noise efficiency factor (NEF) of 5, and a power efficiency factor (PEF) of 44, which both represent the state of the art. A pressure sensing system, built with the ROIC and a differential pressure sensor (AC4010), achieves 10.1-mPa (1) resolution in a 0.5-ms conversion time. The ROIC dissipates about 30% of the system’s power dissipation and contributes about 6% of its noise power. To reduce the sensor’s offset drift, a temperature compensation scheme based on an external reference resistor is used. After a two-point calibration, this scheme reduces bridge offset drift by 80× over a 50 °C range. Subject Beyond the railsbridge offset compensationbridge sensorcapacitively coupled (CC) chopperCC instrumentation amplifier (CCIA)continuous-time delta-sigma modulator (CTΔ Σ M)energy efficientreadout IC (ROIC)temperature compensation To reference this document use: http://resolver.tudelft.nl/uuid:468f8f6b-3527-445d-b294-3191d38f0814 DOI https://doi.org/10.1109/JSSC.2018.2885556 Embargo date 2022-03-25 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 54 (3), 856-864 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 H. Jiang, S. Nihtianova, K.A.A. Makinwa Files PDF An_Energy_Efficient_3.7_n ... Scheme.pdf 3.63 MB Close viewer /islandora/object/uuid:468f8f6b-3527-445d-b294-3191d38f0814/datastream/OBJ/view