Circuit and method to eliminate startup and shutoff runt pulses from crystal oscillators
US7057434B1 · kind B1 · utility
0Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2004 |
| Grant date | Jun 6, 2006 |
| Priority date | — |
| Expiry date | Jun 23, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L3/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A crystal oscillator circuit which does not produce runt pulses when the oscillator is turned on or off. The circuit includes a crystal oscillator, an integrator which integrates the energy in a plurality of pulses, a threshold circuit which is active when the output of the integrator reaches a pre-specified threshold and gating circuits which gate the output of the crystal oscillator to the output terminal only when the threshold circuit has reached the specified threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.