Resonant impedance sensing with a negative impedance control loop implemented with synchronized class d and output comparators
US-2017234701-A1 · Aug 17, 2017 · US
Sensor device
US12372592B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12372592-B2 |
| Application number | US-202318386351-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 2, 2023 |
| Priority date | May 14, 2021 |
| Publication date | Jul 29, 2025 |
| Grant date | Jul 29, 2025 |
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Abstract
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A sensor device includes a bridge circuit, a bias circuit, and a detection signal receiving circuit. The bridge circuit includes four sensor elements connected in a bridge. The bias circuit includes an oscillation circuit and an averaging circuit. The oscillation circuit outputs an oscillation signal, in which an output voltage in a first output state and an output voltage in a second output state with temperature dependency repeat alternately at a predetermined ratio. The averaging circuit averages the output voltage of the oscillation circuit and applies the averaged output voltage as a bias voltage to a bias end of the bridge circuit. By applying this voltage, the bias circuit excites the bridge circuit and compensates for a temperature characteristic of the sensitivity by offsetting a temperature fluctuation due to a temperature change in its sensitivity.
First claim
Opening claim text (preview).
What is claimed is: 1. A sensor device comprising: a bridge circuit including at least one sensor element with a characteristic that changes in accordance with a physical quantity to be detected; a detection signal receiving circuit to receive a sensor detection signal output from a detection signal output end of the bridge circuit in accordance with a change in the characteristic of the sensor element; an oscillation circuit to alternately output an output voltage of a first…
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Frequently asked questions
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- What does patent US12372592B2 cover?
- A sensor device includes a bridge circuit, a bias circuit, and a detection signal receiving circuit. The bridge circuit includes four sensor elements connected in a bridge. The bias circuit includes an oscillation circuit and an averaging circuit. The oscillation circuit outputs an oscillation signal, in which an output voltage in a first output state and an output voltage in a second output st…
- Who is the assignee on this patent?
- Murata Manufacturing Co
- What technology area does this patent fall under?
- Primary CPC classification G01R33/0082. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jul 29 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).