SU1109853A1 - Temperature compensation device for crystal oscillator - Google Patents

Abstract

A THERMO-COMPENSATION DEVICE FOR A QUARTZ GENERATOR, containing a series of thermally-dependent voltage generator, an analog adder and a frequency-controlled crystal oscillator connected in series, characterized in that, in order to increase frequency stability, a second thermometer-dependent thermometer and an in- tenu- dyfu- zher of the art designer have been installed and I have worked as an in-art programmer. the second input of the analog adder, while the output of the second thermal-dependent voltage driver is connected to input integrodifferen1 functional transducer.

Description

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00 The invention relates to radio engineering and can be used in highly stable sources of vibration. A crystal oscillator is known that contains a ring-connected amplifier and a positive feedback circuit with a crystal oscillator, which are placed in the Cl 1 thermostat. However, this crystal oscillator has low efficiency and long frequency setting time. The closest to the invention to the technical essence is the device of thermal compensation of the quartz oscillator, which contains successively connected first thermal-dependent voltage driver, analog combiner and frequency-controlled crystal oscillator t 2. However, the known device for thermal compensation of a quartz oscillator has a low frequency stability during sudden changes in ambient temperature. The purpose of the invention is to increase frequency stability. This goal is achieved by the fact that a second thermal-dependent on shaper and integro-differential reference transducer, the output of which is connected to the second one, is introduced into a thermal compensation device of a quartz oscillator containing serially connected first shaper of thermo-dependent voltage, analog adder and frequency controlled quartz generator. the input of the analog adder, while the output of the second thermal-dependent voltage driver is connected to the input of the integ differentiating functional interface converter. Fig. 1 shows a structural diagram of the proposed device for thermal compensation of a quartz oscillator in Fig. 2, an example of the implementation of an integra differentiation functional converter; Fig. 3 shows diagrams explaining the principle of operation of the proposed device. The thermal compensation device of the quartz generator contains the first shaper of thermal-dependent 1 for the yarn, analog adder 2, frequency-controlled crystal oscillator 3, the second thermal-dependent shaper 4 of the thermo-dependent voltage and the integrating functional converter 5. At the same time, the integrating functional transformer 5 can be implemented as integro-differentiating circuit containing resistors 6-8 and capacitors 9-11 (figure 2). The device works as follows. The structure of the first driver 1 is chosen so that, with a slow temperature change, to ensure the maximum temperature stability of the output oscillation frequency. In this case, a signal is supplied to the first input of the analog adder 2, which compensates for the frequency drift caused by the quasistatic temperature characteristic. At a constant temperature, the second driver 4 and the integro-differentiating functional converter 5 do not affect the frequency of the output signal, since the capacitor 11 prevents the flow of direct current from the output of the second driver 4 to the input ana-. at a non-stationary thermal effect, for example, with a temperature jump T (Fig. Zy), the output voltage at the output of the second driver 4 repeats the shape of the temperature jump (Fig. 3 c). Fig. 3 shows the response of the output frequency of the frequency controlled quartz oscillator 3 to a temperature jump with the second input of the analog adder 2 disconnected. To eliminate the dynamic frequency surge to the input of the analog adder 2, the control voltage U is applied (Fig. 31-) which synthesizes an integro-differentiating functional converter 5 from the voltage drop U applied to its input. The constant of the time of the second organizer must be less than the time of increasing the dynamic ejection f in ,,, x (T) (Fig. B). The complex integrating circuit of the resistor 6 - capacitor 9 - resistor 7 - capacitor 10 simulates the thermal inertial properties of the cavity resonator placed in a specific design, allows

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to obtain a control voltage corresponding to the shape (with a linear control characteristic) dynamic frequency variation (Fig.36 and d), and thus provides a quadratic dependence on the initial part of the dependence on (Uj / 1 (T),. Differentiating circuit capacitor 11 - resistor 8 out of the signal smoothed by the integrated signal is proportional to the rate of temperature change and provides a decrease of the function Uj / (t) according to an exponential law similar to the dependence fg (,, x -1 (Thus, the voltage post Paet

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to analog adder 2 and further to the control input of a frequency controlled quartz oscillator 3. Thus, the voltage delivered to the control input of a frequency controlled quartz oscillator 3 ensures the constancy of the generated frequency both at slow and at rapid changes in temperature.

The technical and economic efficiency of the proposed device for thermal compensation of a quartz oscillator consists in increasing the frequency stability of the output oscillations under non-stationary temperature effects.

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Claims (1)

A TEMPERATURE COMPENSATION DEVICE FOR A QUARTZ GENERATOR, comprising a first thermally dependent voltage shaper, an analog adder and a frequency-controlled crystal oscillator, connected in series, characterized in that, in order to increase the frequency stability, a second thermally dependent voltage shaper and an integro-differentiating functional converter are introduced, the output of which is connected to a second an analog adder, while the output of the second shaper voltage-dependent voltage is connected to the input ntegrodifferentsiruyuschego functional converter. Exit Figure 1>