Digitally temperature compensated voltage-controlled oscillator tunable to different frequency channels
US5912595A · kind A · utility
Inventors
Key dates
| Filing date | Dec 16, 1997 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Dec 16, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B2201/0208
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digitally temperature compensated oscillator (TCO) system is provided which is capable of memorizing in an EEPROM-based look-up table, appropriate digital values of a temperature correction for a voltage controlled oscillator (VCO). An on-board temperature sensing mechanism tracks variations in temperature in the TCO and produces an analog voltage value corresponding to the instantaneous temperature. The voltage value of the sensor output is digitized and designated to constitute an address into the EEPROM based look-up table. As the temperature changes, the digitized output of the temperature sensor and hence the address to the EEPROM changes accordingly. The EEPROM also includes a look-up table of digitized channel tuning voltage values for tuning the VCO to at least one frequency for transmitting or receiving at least one channel, for example in the FRS group of channels. One of these digitized values is selected in response to operator selection of a channel. A temperature correction voltage value corresponding to the address represented by the measured temperature is extracted from the values stored within the EEPROM table and combined with the selected digitized channel tun…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.