Print Email Facebook Twitter A Continuous-Time Ripple Reduction Technique for Spinning-Current Hall sensors Title A Continuous-Time Ripple Reduction Technique for Spinning-Current Hall sensors Author Jiang, J. (TU Delft Electronic Instrumentation) Kindt, Wilco J. (Texas Instruments Holland) Makinwa, K.A.A. (TU Delft Electronic Instrumentation) Date 2014 Abstract This paper presents a new ripple-reduction technique for spinning-current Hall sensors, which obviates the need for lowpass filtering to suppress the ripple caused by up-modulated sensor offset. A continuous-time ripple-free output is achieved by the use of three ripple reduction loops (RRLs), which continuously sense the offset ripple and then use this information to drive a feedbackloop that cancels sensor offset before amplification. Since no low-pass filter is involved, the bandwidth of the resulting system can be much higher than the spinning frequency. Moreover, since the front-end no longer has to process sensor offset, the requirements on its dynamic range can be significantly relaxed. A prototype system consisting of a Hall sensor readout system realized in a 0.18 m CMOS process was combined with three off-chip RRLs realized with off-chip electronics.At a spinning frequency of 1 kHz, the RRLs reduce the offset ripple by more than 40 dB to about 10 T, while also achieving low offset (25 T) and wide bandwidth (over 100 kHz). Subject Hall sensorripple reduction loop (RRL)spinning-current To reference this document use: http://resolver.tudelft.nl/uuid:5c2fb86d-833c-4e20-b102-45e2a5b1f811 DOI https://doi.org/10.1109/JSSC.2014.2319252 ISSN 0018-9200 Source IEEE Journal of Solid State Circuits, 49 (7), 1525-1534 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2014 J. Jiang, Wilco J. Kindt, K.A.A. Makinwa Files PDF 2040072_JSSC2319252.pdf 1.52 MB Close viewer /islandora/object/uuid:5c2fb86d-833c-4e20-b102-45e2a5b1f811/datastream/OBJ/view