IP Library › Granted Patent US 12,442,683
Granted Patent B2
US 12,442,683 · App. 17/980,429 · Granted Oct 14, 2025

Single-capacitor inductive sense systems

Inventors: Jason L. Wardlaw (Austin, TX); Michael A. Kost (Cedar Park, TX); Anthony S. Doy (Los Gatos, CA); Tejasvi Das (Austin, TX); Siddharth Maru (Austin, TX); Xin Zhao (Austin, TX); Matthew Beardsworth (Austin, TX); Bruce E. Duewer (Round Rock, TX)
Assignee: Cirrus Logic Inc.
G01H13/00G01L9/007G01L9/0072G01R27/02G01R27/26G01R27/2605G01R27/2611G01R27/28G06F3/016
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Quick Facts
Patent No.
US 12,442,683
App. No.
17/980,429
Filed
Nov 3, 2022
Granted
Oct 14, 2025
Kind
B2
Examiner
HE, AMY
Art Unit
2858
USPC
324/636
Abstract

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

Claims (27)

1. A system comprising:

an array of sensor elements;

a driver configured to drive the array of sensor elements;

a switch network comprising a plurality of switches coupled between the array of sensor elements and the driver; and

control circuitry configured to:

control the switch network to selectively enable and disable multiple switch configurations for driving by the driver; and

control the array of sensor elements, such that when one of the array of sensor elements is enabled, the one of the array of sensor elements is in parallel with a series combination of the others of the array of sensor elements.

2. The system of claim 1 , wherein the array of sensor elements each comprises a first type of passive reactive element.

3. The system of claim 2 , wherein the array of sensor elements is electrically coupled to a second type of passive reactive element.

4. The system of claim 3 , wherein the driver is further configured to drive the second type of passive reactive element.

5. The system of claim 3 , wherein the control circuitry is further configured to control enabling and disabling of individual sensor elements of the array of sensor elements such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

6. The system of claim 1 , wherein the control circuitry is configured to control the array of sensor elements, such that when one of the array of sensor elements is enabled, the one of the array of sensor elements is isolated from the others of the array of sensor elements.

7. The system of claim 6 , wherein each of the array of sensor elements has a common return path.

8. The system of claim 1 , wherein the control circuitry is further configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time.

9. The system of claim 1 , wherein the control circuitry is further configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure that adjacent sensor elements of the array of sensor elements are not enabled at the same time.

10. A method comprising:

driving an array of sensor elements with a driver;

controlling individual switches of a switch network comprising a plurality of switches coupled between the array of sensor elements and the driver to selectively enable and disable multiple switch configurations for driving by the driver; and

controlling the array of sensor elements, such that when one of the array of sensor elements is enabled, the one of the array of sensor elements is in parallel with a series combination of the others of the array of sensor elements.

11. The method of claim 10 , wherein the array of sensor elements each comprises a first type of passive reactive element.

12. The method of claim 11 , wherein the array of sensor elements is electrically coupled to a second type of passive reactive element.

13. The method of claim 12 , further comprising driving the second type of passive reactive element.

14. The method of claim 12 , further comprising enabling and disabling individual sensor elements of the array of sensor elements such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

15. The method of claim 10 , further comprising controlling the array of sensor elements, such that when one of the array of sensor elements is enabled, the one of the array of sensor elements is isolated from the others of the array of sensor elements.

16. The method of claim 10 , wherein each of the array of sensor elements has a common return path.

17. The method of claim 10 , further comprising enabling and disabling individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time.

18. The method of claim 10 , further comprising enabling and disabling individual sensor elements of the array of sensor elements to ensure that adjacent sensor elements of the array of sensor elements are not enabled at the same time.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 24, 2025
From: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.
To: CIRRUS LOGIC, INC.
Reel/Frame 071824/0966 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 3, 2022
From: WARDLAW, JASON L.; KOST, MICHAEL A.; DOY, ANTHONY S.; DAS, TEJASVI; MARU, SIDDHARTH; ZHAO, XIN; BEARDSWORTH, MATTHEW; DUEWER, BRUCE E.
To: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.
Reel/Frame 061651/0281 →
Continuity (3)
Continuation 16517046 · Jul 19, 2019
Provisional Application 62810614 · Feb 26, 2019
Related Publication 20230082721A1 · Mar 16, 2023
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