Method and apparatus for producing a temperature stable frequency using two oscillators
US5831485A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Sep 4, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R35/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for producing a temperature stable frequency at reduced cost. Advantage is taken of an existing, relatively temperature insensitive, low frequency and low cost watch crystal and an existing, high frequency, low cost, but relatively temperature sensitive system clock. A calibration module coupled to the watch crystal and clock calibrates the watch crystal to a reference frequency at a reference temperature and calibrates the clock to the watch crystal at an operating temperature, to relate the clock frequency to the reference frequency at any operating temperature and thereby provide a high precision, relatively temperature insensitive time or frequency base at low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.