RU756U1 - Crystal oscillator - Google Patents

Abstract

A quartz oscillator containing a transistor, the emitter of which is connected to a common bus through a first resistor, a quartz resonator, the first terminal of which is connected to a common bus, and the second to the first terminal of an inductor, the second terminal of which is connected to the base of the transistor, and a second resistor, which is connected between the first and second terminals of the quartz resonator, a resistive voltage divider that is connected between the power bus and the common bus, the midpoint of which is connected to the base of the transistor, a capacitive divider that is connected between the base of the transistor and the common bus, the midpoint of which is connected to the emitter of the transistor, a capacitor that is connected between the power bus and the common bus, as well as a third resistor that is connected between the power bus and the plus of the power source, characterized in that a parallel LC circuit is introduced, consisting of an inductor and two series-connected capacitors that are connected between the first and second terminals of the inductance coil of the parallel LC circuit, with the first terminal of the inductance coil of the parallel LC con Cheers is connected to the collector of the transistor, and the second - to a bus supply.

Description

QUARTZ GENERATOR

The proposed utility model relates to o6viacTM radio technology, namely, to the generation of highly stable oscillations and can be used with exciters of radio transmitting and local oscillator receivers,

Known crystal oscillators used as pathogens of radio transmitting and local oscillators of radio receivers.

Such generators are described in a number of books, for example:

I. Radio circuits on transistors and tunnel diodes edited by RD.Valitova, M., Communication, 1972, 385s,

2 Shitikov G, T ,, Tsygankov P.O.Ch., Orlo O.M. Highly stable. quartz autogenvratere. Edited by Shitikov Got. M, Sov.radio, 1974, p. 396.

3, Altshullvr G, B. Quartz frequency stabilization. M., Communication, 1974, p.272.

In portable equipment, single-transistor crystal oscillators are widely used.

Of the known crystal oscillators closest in technical essence to the claimed device is a crystal oscillator described in the book. Altshuller, Quartz frequency stabilization. M., Communication, 1974, ,, which is taken as a prototype of the proposed useful model

The schematic diagram of the generator is shown in figure 1, where it is indicated:

1,4,5,9,11,12 - resistors;

NOS 5/32

- {) 10 - transistor

The quartz crystal contains a transistor 10, the emitter of which is connected through a rezon®p II to a bus, the collector through a resistor 9 to a power bus, ba & a is connected to a power bus through a resistor 4, and through a resistor 5 to a common bus, a coil and inductance 2, the first output of which is connected to base tpaHSMCTOpa 10, and the second with the first output of the quartz resonator 3, the second output of which is connected to a common bus, a resistor I connected between the first m and the second terminals of the quartz resonator a, a capacitor 8 connected between the power bus and the common bus, a resistor 12 connected between tire power supply and power supply plus, capacitors 6 and 7 connected between the base and the emitter of the transiter, the emitter of the transistor and the common bus, respectively

A crystal oscillator operates as follows. When the supply voltage is turned on, undamped oscillations arise in the generator, the frequency of which is determined by the frequency of the sequential resonance of the quartz resonator.

The amplitude is limited due to the non-linearity of the transistor's characteristics, which leads to the establishment of a certain cutoff angle of the collector® current of the transistor.

The cutoff angle is determined by the margin of the generator circuit excitation and, in turn, the harmonic composition of the collector current pulses is foreseen.

The output voltage of the heerator is removed from the resistor 9, that is, “connect the load in parallel with this resistor.

, -ig

a radiator formed by a quartz resonator 3, an inductor 2, capacitors 6 and 7,

The disadvantage of the dknmeg © generator is its low output voltage and low load.

In order to increase the output voltage level during operation, a low-impedance load is introduced into the device circuit instead of a resistor 9, connecting the transistor collector (| 9t 10 with the power bus, parallel

With the circuit ensuring coordination of the load resistance with the output resistance of the generator.

Figure 2 shows a diagram of the proposed generator, where indicated:

1,4,5,11,14 - resistors;

6,7,8,12,13,15 - k @ capacitors;

2.9 - Inductive coils;

3 - quartz resonator;

10 - tranister.

The quartz gemvd ather contains a transistor 10, the emitter of which is connected through a resistor R II to a common bus, the base through a resistor 4 is connected to a power bus, and through a resistor 5 with a common bus, an inductor Z, the first terminal of which is connected to the base of transistor 10, and the second e is the first output of the quartz resonator 3, the second output of which is connected to the common bus, the resistor I and the capacitor 15 connected in series and connected between the first and second conclusions of the quartz crystal, capacitor 8, EXCLUSIVE between the power bus and the common bus, res OP 12, connected between the power bus and the plus of the power source, the capacitors b and 7 of which the first CONNECTIONS are connected to the emit vm of the transistor 10, the second output of the capacitor b is connected to the base of the anzieter 10, and the second output of the capacitor 7 with a common bus, parallel to the C circuit, consisting from sequentially

- connected condvnv tvr @ at 12 and 13, connected in parallel to the inductor 9, the first output of which is connected to the collector of transistor 10, and BUtpsa is connected to the power bus.

Geivreet works as follows

When the power is turned on, undamped oscillations occur in the generator. The amplitude of the detected oscillations is determined by the excitation margin. The shaded circuit in the collector circuit of the transistor can be tuned to the main frequency of the generator, as well as to the frequency of the second or first harmonic of the main frequency

The circuit is not connected to the generator circuit, therefore, its influence on the generator circuit is minimal. Using this circuit, you match the low-impedance load with the output resistance of the guierat®ra, which allows you to provide the required voltage level and viscous load.

Thus, the predicted quartz oscillator, which allows providing the necessary voltage level in a single resistor quartz oscillator with a low-impedance load, is, in the opinion of the authors, useful, meets the requirements for a drainage module.

Applicant - All other communications

Deputy, main shezhemer cJ UvSnezhko Yus V

Claims (1)

A quartz oscillator containing a transistor, the emitter of which is connected to a common bus through a first resistor, a quartz resonator, the first terminal of which is connected to a common bus, and the second to the first terminal of an inductor, the second terminal of which is connected to the base of the transistor, and a second resistor, which is connected between the first and second terminals of the quartz resonator, a resistive voltage divider that is connected between the power bus and the common bus, the midpoint of which is connected to the base of the transistor, a capacitive divider that is connected between the base of the transistor and the common bus, the midpoint of which is connected to the emitter of the transistor, a capacitor that is connected between the power bus and the common bus, as well as a third resistor that is connected between the power bus and the plus of the power source, characterized in that a parallel LC circuit is introduced, consisting of an inductor and two series-connected capacitors that are connected between the first and second terminals of the inductance coil of the parallel LC circuit, with the first terminal of the inductance coil of the parallel LC con Cheers is connected to the collector of the transistor, and the second - to a bus supply.