SU678632A1 - Quartz self-excited oscillator - Google Patents

Description

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The invention relates to a coupling technique and can be used in a measuring technique.

Known quartz oscillator, made by three-point capacitive circuit on a transistor with a grounded collector current fl}.

However, this generator has a low frequency stability.

The purpose of vz is the increase in frequency stability of the generated oscillations.

In a quartz oscillator made of a three-point capacitive circuit on a transistor with a grounded collector, in the collector circuit of the transistor of the autogenerator, the transistor of the opposite type iipoBo is connected in series to the transistor, and the base and emitter of one transistor are connected to base and emitter of another transistor through the capacitors.

The drawing shows the principal. electrical circuit of the proposed generator.

The quartz oscillator contains the first and second transistors 1, 2, resistors 3-8, providing DC modes, a quartz resonator 9 and capacitors 10, 11, which form the oscillator circuit of the quartz oscillator, capacitor 12-14, power supply 15.

The proposed oscillator works as follows.

The direct current transistors 1, 2 are connected in series, so that they have the same components of the collector current of FECs, which ensures the identity of their modes and, ultimately, increases the frequency stability. By alternating current, transistors 1, 2 are connected in parallel to the general oscillating circuit and operate in antiphase, so that even higher harmonics of their collector currents are mutually compensated. Odd harmonics are set by selecting the angle of the pick of their collector goqs to be 9 (/. That KIM way, thanks to the inclusion of a granissor 2 in an oscillating circuit, the higher harmonics of the currents are significantly reduced. Using the proposed quartz oscillator increases the frequency stability of the generated oscillations. Invention formula Quartz oscillator produced according to capacitive three-point circuit on a transistor with an AC-grounded collector characterized in that, in order to increase the frequency stability, In the collector circuit of the transistor of a quartz oscillator, a transistor of the opposite type of conductivity is connected in series through a direct current, the base and emitter of one transistor are connected to the base and emitter of the other transistor, respectively, through capacitors 1. Sources of information taken into account during the examination 1. Altshuller G. B, Kvartseva frequency stabilization, M., Sv, 1974, pp. 97, Fig. 6.5.

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