US 11,733,317 B2
Bipolar chopping for 1/f noise and offset reduction in magnetic field sensors
Bradley Neal Engel, Chandler, AZ (US); and Phillip G. Mather, Phoenix, AZ (US)
Assigned to EVERSPIN TECHNOLOGIES, INC., Chandler, AZ (US)
Filed by EVERSPIN TECHNOLOGIES, INC., Chandler, AZ (US)
Filed on May 3, 2022, as Appl. No. 17/735,185.
Application 17/735,185 is a continuation of application No. 17/146,516, filed on Jan. 12, 2021, granted, now 11,353,520.
Application 17/146,516 is a continuation of application No. 16/358,898, filed on Mar. 20, 2019, granted, now 10,928,463, issued on Feb. 23, 2021.
Application 16/358,898 is a continuation of application No. 15/344,149, filed on Nov. 4, 2016, granted, now 10,281,531, issued on May 7, 2019.
Application 15/344,149 is a continuation of application No. 14/495,753, filed on Sep. 24, 2014, granted, now 9,519,034, issued on Dec. 13, 2016.
Claims priority of provisional application 61/993,598, filed on May 15, 2014.
Prior Publication US 2022/0260651 A1, Aug. 18, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 31/00 (2006.01); G01R 33/00 (2006.01); G01R 33/09 (2006.01); G01R 33/06 (2006.01)
CPC G01R 33/0029 (2013.01) [G01R 33/06 (2013.01); G01R 33/09 (2013.01); G01R 33/098 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic sensor system, comprising:
a magnetic sensor, wherein the magnetic sensor includes:
a first plurality of magnetoresistive sensor elements coupled together as a first circuit; and
a second circuit positioned adjacent to the first circuit and configured to receive a bipolar current signal from a bipolar current source coupled to the second circuit, wherein at least a portion of the second circuit is positioned adjacent to each magnetoresistive sensor element of the first plurality of magnetoresistive sensor elements; and
an analog to digital converter coupled to one or more of the first circuit and the second circuit,
wherein one or more of the bipolar current signal and the analog to digital converter is configured to eliminate at least a portion of 1/f noise generated from at least one magnetoresistive sensor element of the first plurality of magnetoresistive sensor elements.