Crystal oscillator control circuit and associated oscillation device
US10666196B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2019 |
| Grant date | May 26, 2020 |
| Priority date | — |
| Expiry date | Jan 2, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2200/0094
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A crystal oscillator control circuit includes a first terminal and a second terminal, a current source, and a peak detection and bias voltage adjustment circuit. The first terminal and the second terminal are arranged to couple the crystal oscillator control circuit to a crystal. The current source is coupled to a power supply voltage and generates a bias current. The peak detection and bias voltage adjustment circuit is coupled between the bias current and a ground voltage and coupled to the first terminal, and performs peak detection and bias voltage adjustment to correspondingly generate a first signal at a node. The low-pass filter low-pass filters the first signal to generate a filtered signal. The feedback control circuit is arranged to perform feedback control according to the filtered signal to generate an oscillation signal at one or both of the first terminal and the second terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.