Temperature compensated signal generator including two crystal o

Details Temperature compensated signal generator including two crystal o Temperature compensated signal generator including two crystal o

1980-05-15

1982-08-17

Grimm, Siegfried H.

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 37, 331 46, 331158, H03B 504, H03B 532

Patent

active

043452213

ABSTRACT:
A signal generator having a digital temperature compensation circuit contains high and low frequency quartz oscillators (HF and NF), the low frequency oscillator being used for temperature compensation. Both oscillators are manufactured such that the descending portion of the temperature dependent parabolic frequency curve of the low frequency oscillator passes through the temperature inversion point of the parabola of the high frequency oscillator.
The frequencies of both oscillators are first adjusted such that the ratio thereof is inversely proportional to the ratio of the parabolic temperature coefficient, i.e., f.sub.1 :f.sub.2 =.beta..sub.2 :.beta..sub.1. Subsequently two substantially identical reference frequencies are adjusted and, by feeding back the output frequency, combined in such a manner that an output frequency independent of temperature is produced which is determined substantially by the high frequency oscillator. The signal generator is thus temperature compensated and, due to the use of a high frequency oscillator, has much better properties with regard to aging and frequency stability than a low frequency oscillator.

REFERENCES:
patent: 3978650 (1976-09-01), Hashimoto et al.
patent: 4071797 (1978-01-01), Zumsteg et al.
patent: 4159622 (1979-07-01), Akahane
Brunner, "Wide-Range Temperature Compensation by Addition of Two Crystal-onator Frequencies", Electronics Letters, Vol. 11, Jul. 10, 1975, pp. 304-305.

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