Oscillators – Solid state active element oscillator – Transistors
Patent
1997-12-16
1999-06-15
Grimm, Siegried H.
Oscillators
Solid state active element oscillator
Transistors
331158, 331176, 331177V, H03B 504, H03L 102
Patent
active
059125950
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 tuning voltage and then converted into a corresponding analog voltage which is used to drive the voltage-controlled oscillator (VCO) in order to maintain the output frequency of the TCO stabilized at a desired value. The TCO includes an on-board microprocessor which allows integration of several of the TCO functions, including analog-to-digital and digital-to-analog, and the storage and retrieval of data to and from the EEPROM containing the look-up tables.
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Ma John Y.
Yuen Sik-Hing
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