Crystal oscillation circuit
US7352256B2 · kind B2 · utility
3Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 6, 2006 |
| Grant date | Apr 1, 2008 |
| Priority date | — |
| Expiry date | Jun 20, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/36
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A crystal oscillation circuit can correctly suppress the resonance of a B mode, thereby correctly excite the resonance of a C mode. Since the crystal oscillation circuit uses a quartz oscillator of an SC cut or an IC cut, the B mode (unnecessary mode) frequency is close to the C mode (main mode) frequency. Therefore, a C mode resonance circuit (main mode resonance circuit) for passing a C mode frequency and a trap circuit for suppressing the oscillation at an unnecessary mode frequency are provided in the feedback loop of the crystal oscillation circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.