Temperature compensated timing signal generator
US8896359B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2013 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | Sep 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G3/022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The temperature compensated timing signal generator comprises a crystal oscillator that generates a reference time signal, and a divider circuit that receives the reference time signal as input and outputs a coarse time unit signal, the coarse time unit signal having an actual frequency deviating from a desired frequency as a function of temperature of the crystal oscillator. The signal generator also includes a high frequency oscillator that generates an interpolation signal having a frequency greater than the frequency of the crystal oscillator. A finite state machine computes a deviation compensating signal as a function of the temperature signal, the signal comprises an integer part representative of an integer number of pulses to be inhibited or injected in the divider circuit and a fractional part representative of how much the output of a new time unit signal pulse should further be delayed to compensate for any remaining deviation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.