A SENSOR READOUT CIRCUITRY, A BIOPOTENTIAL SIGNAL SENSOR, A NEURAL PROBE, AND A METHOD FOR READOUT OF AN ANALOG SENSOR INPUT SIGNAL

Shiwei Wang (Inventor), Marco Ballini (Inventor)

Research output: Patent

Abstract / Description of output

A sensor readout circuitry comprises: a delta-sigma modulator (102); an input stage (110) for receiving an analog sensor input signal, wherein a transconductance amplifier (120) and a current mirror (160) incorporate a flipped voltage follower (128, 130), wherein a feedback signal from a digital-to-analog converter (108) of the delta-sigma modulator (102) is received such that subtraction between the analog sensor input signal and the feedback signal is performed in the transconductance amplifier (120) and mirrored by the current mirror (160) to an output (170, 172) of the input stage (110); wherein the transconductance amplifier (120) comprises a first, second and third chopper (132, 134, 136), whereby a chopping loop between the first, second and third choppers (132, 134, 136) is formed including an input transistor (122) and current sources (180) and whereby the analog sensor input signal is in baseband at a node in which the feedback signal is received.

Original languageEnglish
Patent numberEP4060899
IPCH03M 3/ 02 A I
Priority date16/03/21
Filing date16/03/21
Publication statusPublished - 21 Sept 2022

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