Sensor interface circuit and sensor module
US12401366B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 26, 2021 |
| Grant date | Aug 26, 2025 |
| Priority date | — |
| Expiry date | Sep 30, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A sensor interface circuit includes a frequency synchronization circuit connectable to a sensor. The frequency synchronization circuit includes: a reference voltage source generating a reference voltage; a current source connected to the reference voltage source, and generating a current by using the reference voltage; a voltage difference detection circuit including first and second input nodes and an output node, generating a control voltage according to a difference between voltages received at the first and second input nodes, one of the voltages received at the first and second input nodes corresponding to a detection value of the sensor; a voltage-controlled oscillation circuit connected to the output node, and generating an oscillation signal according to the control voltage; and a frequency/impedance conversion circuit connected between the voltage-controlled oscillation circuit and the second input node, and converting a frequency of a signal according to the oscillation signal into impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.