H - Electricity – 03 – B
Patent
H - Electricity
03
B
331/53
H03B 5/04 (2006.01) H03B 5/36 (2006.01) H03L 1/02 (2006.01) H03B 1/00 (2006.01)
Patent
CA 2018352
A temperature controlled crystal oscillator circuit comprising an amplifier (12) having a feedback path including a crystal (26) and a frequency pulling element (28), and a temperature compensating voltage generating means (30) coupled to the frequency pulling element (28). The voltage generating means (30) applying a voltage, V comp, generated in accordance with a function V comp = b*exp[a1(T-T R)]+b*exp[-a2*(T-T R)]+c*(T-T R) where T R is a reference temperature in degrees Kelvin T is the working temperature in degrees Kelvin a1, a2, b and c are constants.
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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