SU1224948A1 - Crystal oscillator - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to observe the frequency stability in the range tp with varying load parameters. Device contains two transistors (T) 1,2, a quartz resonator (КР) 13, six resistors (Р) 3, 4, 5, 6, 7, 8, two capacitors (К) 9, 10, blocking К 11 and contour- К 12. The quartz oscillator is excited at a frequency close to the frequency of the series resonance KP 13, since RF resistance in the base circuit T 1 is minimal. The magnitude of the constant voltage between the collector. rum and emitter TI is determined by the value of P 6, 7, 8 and their appropriate choice ensures that T 1 operates in active mode, therefore, changing the voltage at the emitter junction T 2 when changing t-ry over wide limits has a much smaller effect, and turning on KP I3 in the base circuit T 1 allows to significantly reduce the effect of changes in load parameters. The goal is achieved by the introduction of K9, 10 and Р4, 5 and the corresponding connection of circuit elements. 1 il. I (L ND 4 CO | 00

Description

one

The invention relates to radio engineering and can be used as a source of highly stable ultra-high frequency oscillations.

The purpose of the invention is to increase the frequency stability in the temperature range with varying load parameters.

- In the drawing, an electrical circuit diagram of a quartz oscillator is shown.

The quartz generator contains the first 1 and second 2 transistors, the first 3, the second and the third and 5 additional resistors, resistors 6-8, the first 9 and second 10 capacitors, blocking capacitor I1, loop capacitor 12, quartz resonator 13,

Quartz generator works as follows.

When the band-pass filter is turned on according to an equivalent circuit in parallel (at high frequency) to the amplifier stage, executed on the first transistor 1, it turns out that the circuit consisting of the equivalent inductance of the stage performed on the second transistor 2 and the loop capacitor 12 is connected through the first capacitor 9 between the collector of the first transistor 1 and the common bus The excitation of a quartz oscillator at a given mechanical harmonic of the quartz resonator 13 is carried out by setting the equivalent circuit in and the collector of the first transistor 1 by changing the capacitance of the capacitor of the loop 12. The crystal oscillator is driven at a frequency close to the frequency of series resonance of the quartz resonator 13 in connection with the fact that high frequency resistance in the base circuit of the first transistor gchtalno I E.

The magnitude of the DC voltage between the collector and the emitter of the first transistor 1 is determined by the size of the resistors 6-8, and their respective selection ensures that the first transistor 1 operates in active mode. Therefore, the voltage change at the emitter junction.

VNIIPI Order 1961/55 Circulation 816 Subscription Polyz. Ave, ,, Uzhg%) Rod5 st. Project, 4

24948I

The second transistor 2, when the temperature varies over a wide range, has a much smaller effect compared to the pro- to-device.

The inclusion of a quartz resonator 13 in the base circuit of the first transistor 1 allows to significantly reduce the effect of changes in the parameters of the load "0K

A quartz oscillator containing the first transistor, the base, the emitter and

the collector of which is connected to the power bus, common bus and power bus, the second transistor, the type of structure of which is opposite to the structure of the first transistor, the crystal, the first pin of which is connected to the common bus, the blocking capacitor, the first output of which is connected to

common bus, loop capacitor, the first output of which is connected to the emitter of the second transistor, as well as the first additional resistor, while the emitter of the first transistor is connected to the base of the second transistor, which is characterized by the fact that in order to increase the frequency stability in the temperature range with varying parameters load, it introduced the first capacitor, which is connected between the collector of the first transistor and the emitter of the second transistor, the second capacitor, which is connected between the base of the first transistor and the second the output of the crystal, the second and third additional resistors, the first outputs of which are connected to the common bus, and the second outputs are connected respectively to the second output of the crystal and the base of the first transistor, while the collector of the second transistor is connected to the common bus, the first additional resistor is connected between the emitter of the second transistor

and a power bus, the second terminals of the blocking capacitor and the loop capacitor are connected to the power bus.

Claims (1)

Claim A quartz oscillator containing a first transistor, a base, an emitter and a collector of which through respective resistors are connected respectively to a power bus, a common bus and a power bus, a second transistor whose structure type is opposite to the structure type of the first transistor, a quartz resonator, the first terminal of which is connected to a common bus , a blocking capacitor, the first output of which is connected to a common bus, a loop capacitor, the first output of which is connected to the emitter of the second transistor, and also the first additional a transistor, while the emitter of the first transistor is connected to the base of the second transistor, characterized in that, in order to increase the frequency stability in the temperature range with changing load parameters, the first capacitor is inserted into it, which is connected between the collector of the first transistor and the emitter of the second transistor., the second capacitor, which is connected between the base of the first transistor and the second output of the quartz resonator, the second and third additional resistors, the first conclusions of which are connected to a common bus, and the second s are respectively connected to the second terminal of the quartz crystal and the base of the first transistor, the collector of the second transistor is connected to a common bus, a first further resistor connected between the emitter of the second transistor and the power bus, the second terminals of the capacitor and the blocking capacitor of the loop connected to the power bus. VNIIPI Order 1961/55 Circulation 816 Signed Custom polygr. pr-tie ₉ , Uzhhorod, st. Project, 4