Symmetrical clock crystal oscillator circuit
US5455542A · kind A · utility
18Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1993 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Nov 22, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0307
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator circuit provides a symmetrical signal without halving the frequency of a crystal oscillator 12. The input 14 of the crystal oscillator 12 is low pass filtered, and the output 18 of the filter 16 is differential voltage compared with the input 14 of the crystal oscillator 12. The output 22 of the differential voltage comparator 20 is symmetrical and of the same frequency as the crystal oscillator 12. The crystal oscillator 12 is preferably a Pierce oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.