FUNCTION GENERATION CIRCUIT, CRYSTAL OSCILLATION DEVICE, AND METHOD OF ADJUSTING THE CRYSTAL OSCILLATION DEVICE

A temperature compensating crystal oscillation device includes a constant voltage circuit for outputting a predetermined voltage independent of the ambient temperature, a temperature sensor circuit for outputting a voltage in proportion to the ambient temperature, and a control circuit for receiving...

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Bibliographic Details
Main Authors TATEYAMA, YUICHI, SAEKI, TAKAHARU, TAKEUCHI, HISATO, SHIBUYA, SHUJI, MATSUURA, JUNICHI
Format Patent
LanguageEnglish
French
German
Published 15.12.2004
Edition7
Subjects
ANALOGUE COMPUTERS
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
BASIC ELECTRONIC CIRCUITRY
CALCULATING
COMPUTING
COUNTING
ELECTRICITY
GENERATION OF NOISE BY SUCH CIRCUITS
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER
PHYSICS
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Summary:A temperature compensating crystal oscillation device includes a constant voltage circuit for outputting a predetermined voltage independent of the ambient temperature, a temperature sensor circuit for outputting a voltage in proportion to the ambient temperature, and a control circuit for receiving the constant voltage output from the constant voltage circuit and the voltage output in proportion to the temperature from the temperature sensor circuit and for generating a control voltage (Vc) used for compensating a temperature characteristic of a quartz oscillator in the entire range of the ambient temperature through polygonal lines approximation of a negative cubic curve by using continuous lines. Furthermore, the crystal oscillation device includes a VCXO whose oscillation frequency is controlled to be a predetermined value by the control voltage (Vc).
Bibliography:Application Number: EP19980931010