Temperature-compensated oscillator circuit
US5525936A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1995 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | May 23, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/025
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A temperature compensated oscillator circuit includes an oscillator (1) which is controlled by a processor (8) . The output frequency (fx) of the oscillator (1) or an external reference frequency (fref) are used as reference signal in conjunction with a dual mode oscillator (9) which can be switched to provide temperature dependent fundamental (f1) and third (f3) harmonic frequencies. By the use of switches (S1, S2 S3), a divider (2) and first and second counters (3, 10) both calibration and temperature compensation of the oscillator (1) are carried out via the processor (8), using the substantially linear temperature dependence of the frequency difference between the third harmonic (f3) and three times the fundamental frequency (3f1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.