Magnetic Field Sensor

Patent metadata

Field	Value
Publication number	US-2016282425-A1
Application number	US-201514670453-A
Country	US
Kind code	A1
Filing date	Mar 27, 2015
Priority date	Mar 27, 2015
Publication date	Sep 29, 2016
Grant date	—

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.

First claim

What is claimed is:

1 . A magnetic field sensor comprising:
a chopper stabilized amplifier; and a plurality of Hall-type elements in parallel and connected to the chopper stabilized amplifier.

2 . The sensor of claim 1 wherein the plurality of Hall-type elements comprises at least one of a Hall quad element, a Hall dual element or a Hall octal element.

3 . The sensor of claim 1 , wherein the Hall-type elements are disposed in a configuration to include an equal number of Hall-type elements on each side of a conduction loop.

4 . The sensor of claim 3 , wherein the Hall-type elements are disposed inside the conduction loop are disposed in a reverse polarity than the Hall-type elements outside the conduction loop.

5 . The sensor of claim 1 , wherein the plurality of Hall-type elements are fabricated in silicon, and
wherein the bandwidth of the sensor is 1 MHz.

6 . A magnetic field sensor comprising:
a chopper stabilized amplifier; and a plurality of Hall quad elements in parallel and connected to the chopper stabilized amplifier.

7 . The sensor of claim 6 , wherein the Hall quad elements are disposed in a configuration to include an equal number of Hall quad elements on each side of a conduction loop.

8 . The sensor of claim 7 , wherein the Hall quad elements are disposed inside the conduction loop are disposed in a reverse polarity than the Hall quad elements outside the conduction loop.

9 . The sensor of claim 7 , wherein a Hall quad element comprises a rectangular-shaped Hall plate.

10 . The sensor of claim 9 , wherein the Hall quad element comprises a square-shaped Hall plate.

11 . The sensor of claim 6 , wherein the Hall quad element comprises a cross-shaped Hall plate.

12 . The sensor of claim 6 , wherein a Hall quad element comprises four Hall plates of substantially similar shape.

13 . The sensor of claim 6 , further comprising an epitaxial resistor in parallel with the plurality of Hall quad elements.

14 . The sensor of claim 6 , wherein the plurality of Hall quad elements are fabricated in silicon.

15 . The sensor of claim 14 , wherein the bandwidth of the sensor is 1 MHz.

16 . The sensor of claim 6 , wherein the sensor is a current sensor.

17 . The sensor of claim 6 , wherein a resistance of a Hall quad element 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.

18 . A current sensor comprising:
a chopper stabilized amplifier; and a plurality of Hall quad elements in parallel and 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.

19 . The current sensor of claim 18 , wherein the Hall quad elements are disposed in a configuration to include an equal number of Hall quad elements on each side of a conduction loop.

20 . The current sensor of claim 19 , wherein the Hall quad elements are disposed inside the conduction loop are disposed in a reverse polarity than the Hall quad elements outside the conduction loop.

21 . The current sensor of claim 18 , wherein the Hall quad element comprises a square-shaped Hall plate.

22 . The current sensor of claim 18 , wherein the Hall quad element comprises a cross-shaped Hall plate.

23 . The current sensor of claim 18 , wherein a Hall quad element comprises four Hall plates of substantially similar shape.

24 . The current sensor of claim 18 , further comprising an epitaxial resistor in parallel with the plurality of Hall quad elements.

25 . The current sensor of claim 18 , wherein a resistance of a Hall quad element 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.

Assignees

• Allegro Microsystems Llc

Inventors

• Haas David J
• Gaboury Michael
• Latham Alexander

Classifications

• G01R19/0092

  Measuring current only · CPC title

• G01R33/072 Primary

  Constructional adaptation of the sensor to specific applications · CPC title

• G01R15/202

  using Hall-effect devices (Hall elements in arrangements for measuring electrical power G01R21/08) · CPC title

• G01R33/0035

  Calibration of single magnetic sensors, e.g. integrated calibration · CPC title

• G01R33/07

  Hall effect devices · CPC title