US 11,949,297 B2
Methods for analog temperature compensation of bias and offsets of a differential sensor
Richard S. Lech, Hamden, CT (US); and Alok Agrawal, North Haven, CT (US)
Assigned to COVIDIEN LP, Mansfield, MA (US)
Appl. No. 17/431,463
Filed by Covidien LP, Mansfield, MA (US)
PCT Filed Mar. 2, 2020, PCT No. PCT/US2020/020695
§ 371(c)(1), (2) Date Aug. 17, 2021,
PCT Pub. No. WO2020/185440, PCT Pub. Date Sep. 17, 2020.
Claims priority of provisional application 62/815,513, filed on Mar. 8, 2019.
Prior Publication US 2022/0140702 A1, May 5, 2022
Int. Cl. H02K 11/24 (2016.01); A61B 34/00 (2016.01); A61B 34/37 (2016.01); A61B 90/00 (2016.01); G01K 1/02 (2021.01); G01K 7/00 (2006.01); G01L 3/10 (2006.01); G01L 25/00 (2006.01); H02K 11/25 (2016.01); H02P 29/68 (2016.01)
CPC H02K 11/24 (2016.01) [A61B 34/25 (2016.02); A61B 34/37 (2016.02); A61B 34/74 (2016.02); G01K 1/026 (2013.01); G01K 7/00 (2013.01); G01L 3/108 (2013.01); G01L 25/003 (2013.01); H02K 11/25 (2016.01); H02P 29/68 (2016.02); A61B 2090/066 (2016.02)] 16 Claims
OG exemplary drawing
 
1. A measurement circuit configured to provide a torque reading to a motion controller, the measurement circuit comprising:
an offset controller configured to read a temperature signal and to generate an offset voltage in response to reading the temperature signal;
an amplifier configured to read a differential voltage from a differential sensor and to receive the offset voltage from the offset controller, to add the offset voltage to the differential voltage after applying an analog gain to the differential voltage to generate an adjusted voltage, and to transmit the adjusted voltage; and
a temperature sensor configured to transmit the temperature signal indicative of a temperature of the differential sensor, wherein the temperature sensor is configured to output the temperature signal as a digital temperature signal and the offset controller is a digital-to-analog converter configured to convert the digital temperature signal to an analog voltage offset indicative of a temperature of the differential sensor.