Crystal oscillator adaptive startup energy minimization
US10491157B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2018 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | Jul 11, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0094
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillation circuit including a crystal interface for coupling to a crystal, a crystal amplifier that drives the crystal to establish oscillation, a memory, a timing circuit, a level detector that provides an amplitude indication when an oscillation achieves a programmable threshold, and a controller. The controller applies one or more settings including gain and activates the crystal amplifier, measures the startup time, and calculates startup energy. The startup energy is based on a bias current of the crystal amplifier, remaining system current, and the startup time. The settings may include a gain setting of the crystal amplifier and one or more thresholds used by the threshold detector. The controller adjusts the settings for multiple startups, and determines optimal settings for minimizing the startup energy. The memory stores the optimal settings along with robust settings that may be used on a one-time basis in the event of startup failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.