Temperature compensated surface acoustic wave oscillator

Details Temperature compensated surface acoustic wave oscillator Temperature compensated surface acoustic wave oscillator

H - Electricity

03

B

331/55, 331/60

H03B 5/04 (2006.01) H03B 5/32 (2006.01) H03H 9/02 (2006.01) H03J 3/04 (2006.01) H03L 1/02 (2006.01)

Patent

CA 1057828

TEMPERATURE COMPENSATED SURFACE ACOUSTIC WAVE OSCILLATOR ABSTRACT Disclosed apparatus compensates for the parabolic temperature induced frequency drift characteristic of a surface acoustic wave tuned oscillator. The apparatus in- cludes a pair of varactor diodes and a temperature sensitive voltage supply. The diodes are series connected and coupled in circuit with the oscillator to affect the frequency thereof. The voltage supply connects to the common connec- tion of the diodes, for producing control voltages thereat. Each varactor diode is chosen to have a .delta. > 1; and the control voltage varies linearly with temperature. This results in a varactor diode capacitance versus temperature characteristic which is a continuous, true parabolic function providing precise compensation for the thermal drift of oscillator frequency.

266515

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