Temperature compensating circuit for use with a crystal oscillator
AssigneeSony Corporation
InventorMasanao Owaki
Life of this patent
Estimating the term…
Abstract
A temperature compensating circuit for use with a crystal oscillator has a first bridge circuit for generating a first DC voltage with a linear functional temperature characteristic, a second bridge circuit for generating a second DC voltage with a quadratic functional temperature characteristic and a circuit for multiplying the first DC voltage and the second DC voltage so as to produce a DC voltage with a cubic functional characteristic. In this case, the DC voltage with the cubic functional characteristic is supplied to an oscillator circuit so as to compensate for variations in frequency of the crystal oscillator caused by temperature changes over a wide range thereof.
Claims8
A temperature compensating circuit for use with a crystal oscillator, comprising:
- a. an oscillation circuit;
- b. a first bridge circuit for generating a first DC voltage having a linear functional temperature characteristic and including at least one temperature responsive variable resistance element;
- c. a second bridge circuit for generating a second DC voltage having a quadratic functional temperature characteristic and including at least two temperature responsive variable resistance elements;
- d. means for multiplying said first DC voltage by said second DC voltage so as to generate a third DC voltage having a cubic functional temperature characteristic;
- and
- e. means for applying said third DC voltage to said oscillation circuit.
Dependencies are inferred from the claim text.