Geometrical instruments – Area integrators – Electrical
Patent
1991-01-23
1992-01-14
Grimm, Siegfried H.
Geometrical instruments
Area integrators
Electrical
331116R, 331176, H03B 532, H03L 102
Patent
active
050814311
ABSTRACT:
A digital temperature-compensated oscillator comprises a crystal oscillator, a first memory previously storing digital temperature compensation data obtained by previously measuring the relation between the ambient temperatures and the frequency deviations of the crystal oscillator, a second memory for storing frequency offset amounts of the oscillation frequency of the crystal oscillator, a temperature sensor for outputting analog detection data relating to the ambient temperature, an A/D converter for converting the analog detection data to digital detection data, a readout circuit for reading out temperature compensation data corresponding to the digital detection data and stored in the first memory according to the digital detection data and reading out the frequency offset amount stored in the second memory according to the digital detection data, an operation circuit for effecting the following calculation by use of the readout temperature compensation data and readout frequency offset amount to derive digital control voltage,
REFERENCES:
patent: 4616173 (1986-10-01), Cook et al.
patent: 4633422 (1986-12-01), Brauer
patent: 4646035 (1987-02-01), Chapelle
patent: 4949055 (1990-08-01), Leitl
Kubo Kuichi
Yamakawa Tsutomu
Yoshida Hiroshi
Grimm Siegfried H.
Nihon Dempa Kogyo Co. Ltd.
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