US 12,470,186 B2
High impedance and compact neural sensor front-end
Milad Zamani, Risskov (DK); Amin Rashidi, ZG Delft (NL); and Farshad Moradi, Risskov (DK)
Assigned to AARHUS UNIVERSITET, Aarhus C (DK)
Appl. No. 18/023,630
Filed by AARHUS UNIVERSITET, Aarhus C (DK)
PCT Filed Sep. 1, 2021, PCT No. PCT/EP2021/074101
§ 371(c)(1), (2) Date Feb. 27, 2023,
PCT Pub. No. WO2022/049108, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 20193853 (EP), filed on Sep. 1, 2020.
Prior Publication US 2023/0318549 A1, Oct. 5, 2023
Int. Cl. H03F 3/45 (2006.01); H03F 1/56 (2006.01); H03F 3/387 (2006.01); A61B 5/00 (2006.01); A61B 5/279 (2021.01)
CPC H03F 3/387 (2013.01) [H03F 1/56 (2013.01); A61B 5/279 (2021.01); A61B 5/7203 (2013.01); H03F 2200/156 (2013.01); H03F 2200/261 (2013.01); H03F 2200/375 (2013.01); H03F 2200/42 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A front-end device arranged to amplify an electric signal from an associated sensor, the front-end device comprising
an input terminal arranged for electric connection to the sensor so as to receive an electric signal from the sensor;
an output terminal arranged to output an amplified electric signal; and
an amplifier circuit connected between the input and output terminals, wherein the amplifier circuit comprises a capacitive-coupled chopper circuit comprising a first gain element and first, second and third chopper switches arranged for operating at a chopper frequency (fch), wherein the amplifier circuit further comprises;
an impedance boosting auxiliary path connected to the input terminal (Vin) in parallel with a first chopper switch of the CCC, wherein the impedance boosting auxiliary path comprises a pre-charging buffer, and
a second gain element connected in a feedback path of the CCC.