Print Email Facebook Twitter A 4.5 nV/√Hz Capacitively Coupled Continuous-Time Sigma-Delta Modulator with an Energy-Efficient Chopping Scheme Title A 4.5 nV/√Hz Capacitively Coupled Continuous-Time Sigma-Delta Modulator with an Energy-Efficient Chopping Scheme Author Jiang, H. (TU Delft Electronic Instrumentation) Ligouras, C. (TU Delft Electronic Instrumentation) Nihtianova, S. (TU Delft Electronic Instrumentation) Makinwa, K.A.A. (TU Delft Microelectronics) Department Microelectronics Date 2018 Abstract When chopping is applied to a continuous-time sigmadelta modulator (CTΣΔM), quantization noise fold-back often occurs, leading to increased in-band noise. This can be prevented by employing a return-to-zero (RZ) digital-to-analog converter (RZ DAC) in the modulator's feedback path and arranging the chopping transitions to coincide with its RZ phases. In this letter, this technique has been extended and implemented in an energy-efficient CTΣΔM intended for the readout of Wheatstone bridge sensors. To achieve a wide common-mode input range, the modulator's summing node is implemented as an embedded capacitively coupled instrumentation amplifier which can be readily combined with a highly linear 1-bit capacitive RZ DAC. Measurements show that the proposed chopping scheme does not suffer from quantization noise fold-back and also allows a flexible choice of chopping frequency. When chopped at one-tenth of the sampling frequency, the modulator achieves 15 ppm INL, 4.5 nV/√Hz input-referred noise and a state-of-the-art noise efficiency factor of 6.1. Subject Choppingquantization noise fold-backenergyefficientcapacitively-coupled instrumentation amplifiercontinuous-time delta-sigma modulatorWheatstone bridge sensorreadout To reference this document use: http://resolver.tudelft.nl/uuid:d5d8d413-fc82-4eec-8613-fcce3cb47273 DOI https://doi.org/10.1109/LSSC.2018.2803447 Embargo date 2022-03-30 Source IEEE Solid State Circuits Letters, 1 (1), 18-21 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2018 H. Jiang, C. Ligouras, S. Nihtianova, K.A.A. Makinwa Files PDF A_4.5_nV_Hz_Capacitively_ ... Scheme.pdf 1.2 MB Close viewer /islandora/object/uuid:d5d8d413-fc82-4eec-8613-fcce3cb47273/datastream/OBJ/view