SU1107255A1 - Two-step crystal self-excited oscillator - Google Patents

Abstract

A TWO-TURN QUARTZ AVTOGENERATOR containing the first and second transistors, the bases and emitters of which are connected to the power bus and to the common bus, capacitor and p-electrode crystal resonator through appropriate resistors, BCF 0 03 "i; VBr: -, c. .... T -; u ::: -; C: -A SjiiMoreKA the first and second electrodes of which are connected to the bases of the first and second transistors respectively, and the third electrode of which is connected to a common bus, characterized in that, in order to obtain a signal with a double frequency, the collectors of the first and second transistors are combined and the additionally introduced resistor is connected to the power supply bus, a capacitor is connected between the emitters of the first and second transistors, the P-electrode crystal is made four-way electrodes, and the fourth electrode-electrode to Artsev resonator is output oscillation of the fundamental frequency, the point compounds collectors of the first and second transistors is output twice chactoty oscillations.

Description

The invention relates to radio engineering and can be used as a source of highly stable harmonic oscillations.

A push-pull quartz crystal oscillator 5 is known, which is made according to a three-point filter circuit and contains the first and second transistors, a quartz resonator, an inductor, a capacitor, and resistors that provide 10 C11 direct current operation.

The disadvantage of this push-pull quartz oscillator is that it can be generated in the absence of a quartz resonator, and in addition, the presence of an inductor complicates the implementation in the microcircuit design.

The closest in technical essence to the invention is a two-20-cycle quartz oscillator containing the first and second transistors, the bases and emitters of which are connected through the corresponding resistors to the power bus and the common bus, the capacitor and the η-electrode quartz resonator, the first and second electrodes which are connected to the bases of the first and second transistors, and the third electron rod ₃₀ is connected to the common bus. A push-pull quartz oscillator contains a second capacitor, while the capacitors and transistors are turned on so that they form a symmetric multivibrator [2].

However, in the known push-pull quartz oscillator, it is impossible to obtain oscillations with the fundamental and double frequencies.

The purpose of the invention is to obtain a signal with a double frequency.

The goal is achieved by the fact that in a push-pull quartz oscillator containing the first and second transistors, the bases and emitters of which are connected through the corresponding resistors to the power bus and to the common bus, the capacitor and the u-electrode quartz resonator, the first and second electrodes of which are connected to the bases, respectively the first and second transistors, and the third electrode of which is connected to a common bus, the collectors of the first and second transistors are combined and connected through an additional resistor to the power bus, the capacitor is connected between the emitters of the first and second transistors; the quartz electrode resonator is made of four-electrode, while the fourth electrode of the P-electrode quartz resonator is the output of the fundamental frequency oscillations, the connection point of the collectors of the first and second transistors is the double frequency oscillation output.

The drawing shows a circuit diagram of the proposed push-pull quartz oscillator.

A push-pull quartz oscillator contains the first and second transistors 1 and 2, resistors 3-6, a capacitor 7, a P-electrode quartz resonator 8, and an additionally introduced resistor 9.

Push-pull quartz oscillator operates as follows.

When a supply voltage is applied, shock excitation of an I-electrode quartz resonator 8 occurs.

The undamped oscillations are maintained due to the negative resistance introduced by the first and second transistors 1 and 2 and sufficient to compensate for the losses.

At an additionally introduced resistor 9, a voltage with a double frequency is allocated.

The oscillations recorded from the fourth electrode of the η-electrode quartz resonator 8 pass an additional filter system with a narrow passband formed by elementary resonators enclosed between the first and fourth, as well as the second and fourth electrodes of the U-electrode quartz resonator, thereby improving the spectral purity of the signal.

Thus, the proposed push-pull quartz oscillator allows you to expand the functionality by simultaneously receiving the oscillations of the main and doubled frequency while increasing the purity of the spectrum of the output signal.

riiiipts Order 5774/41 Circulation 862 Subscribed

Branch PPP ^ Patent ”, Uzhgorod, Project 4,

Claims (1)

A TWO-STAGE QUARTZ AUTOGENERATOR containing the first and second transistors, the bases and emitters of which are connected through the corresponding resistors to the power bus and to the common bus, a capacitor and an η-electrode quartz resonator, the first and second electrodes of which are connected to the bases of the first and second transistors, respectively and the third electrode of which is connected to a common bus, characterized in that, in order to obtain a signal with a double frequency, the collectors of the first and second transistors are combined through an additional the connected resistor is connected to the power bus, the capacitor is connected between the emitters of the first and second transistors, the P-electrode quartz resonator is made of four electrodes, the fourth electrode of the P-electrode quartz resonator is the output of the fundamental frequency oscillations, the connection point of the collectors of the first and second transistors is the output of the doubled frequency oscillations . 1 1107255 ’