Abstract
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 language | English |
|---|---|
| Patent number | EP4060899 |
| IPC | H03M 3/ 02 A I |
| Priority date | 16/03/21 |
| Filing date | 16/03/21 |
| Publication status | Published - 21 Sept 2022 |