Fully integrated, adjustable oscillator for use with a crystal
US4827226A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1988 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | May 31, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fully integrated, adjustable oscillator circuit for use with a crystal is disclosed in which a crystal oscillator, such as a Pierce oscillator, is arranged to utilize a tuning network that includes at least one integrated varactor (voltage-variable-capacitor) as a shunt element for providing at least one type of adjustment of the oscillating signal. More than one type of adjustment can be provided by including a bank of varactors for each of the shunt elements of the tuning network, in which various individual varactors are selected in binary (on-off) fashion to effect digital as well as analog adjustment of the crystal oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.