Trim circuit and method of oscillator drive circuit phase calibration
US12203774B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2022 |
| Grant date | Jan 21, 2025 |
| Priority date | — |
| Expiry date | Jan 27, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB81B2201/0242
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An oscillator drive circuit and a trim circuit are implemented inside an integrated circuit of a sensor. The drive circuit provides an oscillating drive signal at a resonant frequency to drive a movable mass of the sensor. The drive circuit includes a phase shift circuit having an input for receiving a first signal indicative of an oscillation of the movable mass and having an output. The phase shift circuit adds a phase shift component to the first signal and produces a second signal shifted in phase by the phase shift component. The trim circuit includes a first comparator for receiving the first signal, a second comparator for receiving the second signal, and a processing element. The processing element determines a phase lag between the first and second signals and produces trim code for use by the phase shift circuit, the trim code being configured to adjust the phase shift component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.