Electronic circuit for compensating a sensitivity drift of a hall effect element due to stress
First Claim
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1. An electronic circuit comprising:
- a semiconductor substrate;
an epitaxial layer disposed over a surface of the semiconductor substrate, the epitaxial layer having a first surface distal from the semiconductor substrate and a second surface proximate to the semiconductor substrate; and
,a resistor bridge disposed upon the semiconductor substrate, the resistor bridge comprising;
a first set of resistive elements having a first vertical epitaxial resistor and a first lateral epitaxial resistor coupled in series, wherein the first vertical epitaxial resistor and the first lateral epitaxial resistor are disposed within the epitaxial layer; and
a second set of resistive elements having a second vertical epitaxial resistor and a second lateral epitaxial resistor coupled in series, wherein the second vertical epitaxial resistor and the second lateral epitaxial resistor are disposed within the epitaxial layer,wherein the first set of resistive elements and the second set of resistive elements are coupled in parallel, and wherein the resistor bridge is operable to generate a differential signal responsive to a stress of the semiconductor substrate,wherein the first and second vertical epitaxial resistors each comprise;
respective first and second pickups implanted upon and diffused into the first surface of the epitaxial layer; and
a respective buried structure disposed under the first surface of the epitaxial layer,wherein a respective current passes from the respective first pickup, through a respective first region of the epitaxial layer, through the respective buried structure, and through a respective second region of the epitaxial layer to the respective second pickup.
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Abstract
The present disclosure is directed to an electronic circuit having a Hall effect element and a resistor bridge, all disposed over a common semiconductor substrate. The resistor bridge includes a first set of resistive elements having a first vertical epitaxial resistor and a first lateral epitaxial resistor coupled in series, and a second set of resistive elements having a second vertical epitaxial resistor and a second lateral epitaxial resistor coupled in series. The first set of resistive elements and the second set of resistive elements can be coupled in parallel. The resistor bridge can be configured to sense a stress value of the Hall effect element.
152 Citations
23 Claims
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1. An electronic circuit comprising:
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a semiconductor substrate; an epitaxial layer disposed over a surface of the semiconductor substrate, the epitaxial layer having a first surface distal from the semiconductor substrate and a second surface proximate to the semiconductor substrate; and
,a resistor bridge disposed upon the semiconductor substrate, the resistor bridge comprising; a first set of resistive elements having a first vertical epitaxial resistor and a first lateral epitaxial resistor coupled in series, wherein the first vertical epitaxial resistor and the first lateral epitaxial resistor are disposed within the epitaxial layer; and a second set of resistive elements having a second vertical epitaxial resistor and a second lateral epitaxial resistor coupled in series, wherein the second vertical epitaxial resistor and the second lateral epitaxial resistor are disposed within the epitaxial layer, wherein the first set of resistive elements and the second set of resistive elements are coupled in parallel, and wherein the resistor bridge is operable to generate a differential signal responsive to a stress of the semiconductor substrate, wherein the first and second vertical epitaxial resistors each comprise; respective first and second pickups implanted upon and diffused into the first surface of the epitaxial layer; and a respective buried structure disposed under the first surface of the epitaxial layer, wherein a respective current passes from the respective first pickup, through a respective first region of the epitaxial layer, through the respective buried structure, and through a respective second region of the epitaxial layer to the respective second pickup. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electronic circuit comprising:
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a semiconductor substrate; an epitaxial layer disposed over a surface of the semiconductor substrate, the epitaxial layer having a first surface distal from the semiconductor substrate and a second surface proximate to the semiconductor substrate; a Hall effect element comprising a bounded portion of the epitaxial layer; and a resistor bridge disposed upon the semiconductor substrate and proximate to the Hall effect element, the resistor bridge comprising; a first set of resistive elements having a first vertical epitaxial resistor and a first lateral epitaxial resistor coupled in series, wherein the first vertical epitaxial resistor and the first lateral epitaxial resistor are disposed within the epitaxial layer; and a second set of resistive elements having a second vertical epitaxial resistor and a second lateral epitaxial resistor coupled in series, wherein the second vertical epitaxial resistor and the second lateral epitaxial resistor are disposed within the epitaxial layer, wherein the first set of resistive elements and the second set of resistive elements are coupled in parallel, and wherein the resistor bridge is operable to sense a stress value of the semiconductor substrate and the Hall effect element, and wherein the resistor bridge is operable to generate a differential signal responsive to the stress value of the semiconductor substrate and the Hall effect element, wherein the first and second vertical epitaxial resistors each comprise; respective first and second pickups implanted upon and diffused into the first surface of the epitaxial layer; and a respective buried structure disposed under the first surface of the epitaxial layer, wherein a respective current passes from the respective first pickup, through a respective first region of the epitaxial layer, through the respective buried structure, and through a respective second region of the epitaxial layer to the respective second pickup. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification