H - Electricity – 03 – B
Patent
H - Electricity
03
B
331/53
H03B 5/36 (2006.01) H03L 1/02 (2006.01)
Patent
CA 1038050
CRYSTAL OSCILLATOR TEMPERATURE COMPENSATING CIRCUIT ABSTRACT A circuit for generating a temperature varying control voltage which is applied to a varactor diode to temperature compensate a crystal oscillator is disclosed. The circuit produces a substantially linear voltage versus temperature variation, including a point of inflection, in a middle temperature range, and a substantially non-linear voltage versus temperature variation in hot and cold temperature ranges. The control voltage versus temperature character- istic also undergoes a change in slope polarity in both the hot and cold temperature ranges. The temperature compen- sating circuit has a middle range circuit for independently creating the substantially linear variation in the middle temperature range, a cold range circuit operative below a predetermined temperature for creating the desired variation in the cold temperature range, and a hot temperature circuit operative above a predetermined temperature for creating the desired temperature variation in the hot temperature range. Each temperature range circuit includes a thermistor and a transistor which together control the operative range and the magnitude of the temperature variation contributed by each of the circuits.
248576
Keller Anthony F.
Marvin Dennis F.
LandOfFree
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