# US 10,120,041 B2 · Magnetic field sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,041 B2 - Document ID: US10120041B2 - Status: Granted - Kind: B2 - Application number: 14/670,453 - Filed: 2015-03-27 - Published: 2016-09-29 - Granted: 2018-11-06 - Earliest claimed: 2015-03-27 - Assignees: Allegro MicroSystems, LLC - Applicants: Allegro Microsystems, LLC - Inventors: David J. Haas; Michael Gaboury; Alexander Latham - Web page: https://patentgrep.com/patent/US10120041B2 ## CPC - G01R 33/072: {Constructional adaptation of the sensor to specific applications} - G01R 15/202: {using Hall-effect devices (Hall elements in arrangements for measuring electrical power G01R21/08)} - G01R 19/0092: {Measuring current only} - G01R 33/0017: {Means for compensating offset magnetic fields or the magnetic flux to be measured; Means for generating calibration magnetic fields} - G01R 33/0035: {Calibration of single magnetic sensors, e.g. integrated calibration} - G01R 33/07: Hall effect devices - G01R 33/075: {Hall devices configured for spinning current measurements} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract In one aspect, a magnetic field sensor includes a chopper stabilized amplifier and a plurality of Hall-type elements in parallel and connected to the chopper stabilized amplifier. In another aspect, a magnetic field sensor includes a chopper stabilized amplifier and a plurality of Hall quad elements in parallel and connected to the chopper stabilized amplifier. In a further aspect, a current sensor has a bandwidth of 1 MHz and includes a chopper stabilized amplifier and a plurality of Hall quad elements, fabricated in silicon, in parallel and connected to the chopper stabilized amplifier. ## Claims ### Claim 1 A magnetic field sensor comprising: a chopper stabilized amplifier; and a plurality of at least three Hall-type elements electrically connected in parallel to each other and electrically connected to the chopper stabilized amplifier, wherein the plurality of at least three Hall-type elements ace a plurality of at least four Hall-type elements disposed in a configuration to include an equal number of at least two Hall-type elements disposed on each side of a U-shaped conduction loop, wherein the at least two Hall-type elements disposed inside the U-shaped conduction loop are disposed in an opposite polarity than the at least two Hall-type elements disposed outside the U-shaped conduction loop. ### Claim 2 (depends on 1) The sensor of claim 1 wherein the plurality of at least three Hall-type elements comprises at least one of a Hall quad element, a Hall dual element or a Hall octal element. ### Claim 3 (depends on 1) The sensor of claim 1, wherein the plurality of at least three Hall-type elements are fabricated in silicon, and wherein the bandwidth of the sensor is 1 MHz. ### Claim 4 A magnetic field sensor comprising: a chopper stabilized amplifier; and a plurality of at least three Hall quad elements electrically connected in parallel to each other and electrically connected to the chopper stabilized amplifier, wherein the plurality of at least three Hall quad elements are a plurality of at least four Hall quad elements disposed in a configuration to include an equal number of at least two Hall quad elements on each side of a U-shaped conduction loop, wherein the at least two Hall quad elements disposed inside the U-shaped conduction loop are disposed in an opposite polarity than the at least two Hall quad elements disposed outside the U-shaped conduction loop. ### Claim 5 (depends on 4) The sensor of claim 4, wherein a Hall quad element of the plurality of at least three Hall quad elements comprises a rectangular-shaped Hall plate. ### Claim 6 (depends on 5) The sensor of claim 5, wherein the Hall quad element comprises a square-shaped Hall plate. ### Claim 7 (depends on 4) The sensor of claim 4, wherein a Hall quad element of the plurality of at least three Hall quad elements comprises a cross-shaped Hall plate. ### Claim 8 (depends on 4) The sensor of claim 4, wherein a Hall quad element of the plurality of at least three Hall quad elements comprises four Hall plates of substantially similar shape. ### Claim 9 (depends on 4) The sensor of claim 4, wherein the plurality of at least three Hall quad elements are fabricated in silicon. ### Claim 10 (depends on 9) The sensor of claim 9, wherein a bandwidth of the sensor is 1 MHz. ### Claim 11 (depends on 4) The sensor of claim 4, wherein the sensor is a current sensor. ### Claim 12 (depends on 4) The sensor of claim 4, wherein a resistance of a Hall quad element of the plurality of at least three Hall quad elements is about 4.4 kohm and a capacitance of the Hall quad element is about 0.8 pF, and wherein an input capacitance of the chopper stabilized amplifier is about 1.1 pF. ### Claim 13 A current sensor comprising: a chopper stabilized amplifier; and a plurality of at least three Hall quad elements electrically connected in parallel to each other and electrically connected to the chopper stabilized amplifier, the plurality of Hall quad elements fabricated in silicon, wherein the current sensor has a bandwidth of 1 MHz, wherein the plurality of at least three Hall quad elements are a plurality of at least four Hall quad elements disposed in a configuration to include an equal number of at least two Hall quad elements disposed on each side of a U-shaped conduction loop, wherein the at least two Hall quad elements disposed inside the U-shaped conduction loop are disposed in an opposite polarity than the at least two Hall quad elements disposed outside the U-shaped conduction loop. ### Claim 14 (depends on 13) The current sensor of claim 13, wherein a Hall quad element of the at least three Hall quad elements comprises a square-shaped Hall plate. ### Claim 15 (depends on 13) The current sensor of claim 13, wherein a Hall quad element of the at least three Hall quad elements comprises a cross-shaped Hall plate. ### Claim 16 (depends on 13) The current sensor of claim 13, wherein a Hall quad element of the at least three Hall quad elements comprises four Hall plates of substantially similar shape. ### Claim 17 (depends on 13) The current sensor of claim 13, wherein a resistance of a Hall quad element of the at least three Hall quad elements is about 4.4 kohm and a capacitance of the Hall quad element is about 0.8 pF, and wherein an input capacitance of the chopper stabilized amplifier is about 1.1 pF.