RU8541U1 - QUARTZ GENERATOR - Google Patents

Abstract

A quartz oscillator containing an active part, a thermally dependent potentiometer, the first output of which is connected to the first output of the active part, a quartz resonator, the first output of which is connected to the second output of the active part, a varicap whose cathode is connected to the second output of the quartz resonator, and the anode to the first output the active part, a resistor, the first output of which is connected to the cathode of the varicap, characterized in that the second output of the resistor through the introduced additional resistor is connected to the second output of the thermally dependent potential meter, and a capacitor is connected between the common point of these resistors and the varicap anode.

Description

where G: / add 31 to the oscillation system of the generator of the frequency of the halibody Sc - the curtain of the r®1 radiator according to the reduction of (2) LiaifT about uFEFVOvlSv® m and the smallest value of amplitude

to @ yaebash1§.

For capacitive rvEOFOCH chaghe ehei generators, which are widely used in quartz i iec || fipax control resistance

generator can be u | b | dvd1p1b in the form of: o

 -

where ssffotivmsh e "feedback feedback

 ejpwpioe with one more loss,

From the expressions (1-3) it is possible that it is possible to decrease the settling time and increase the reliability by increasing the value of Z /, the values of the initial |

Known shesh), in which methods of increasing the reliability of boiling and accelerating the time of establishment of oscillations are used.

An increase in the num- ber of the output (Щ) and an increase in the initial amplitude in the device by a.s. SSHR L 815856. The disadvantage of this device is the need for introducing an additional 1duct 11 input into cxei generator, as well as a change in the effect during compensation in the temperature rupture and time.

Increased n | || USSR II09655.

The disadvantage of 81shortwork is to increase the current consumption during gains, which is often unacceptable for micropower annapafipf,

2.

managing director of € | 1M | due to an increase in the resistance of the capacitance, the reverse contact was made in the device according to ASSSSR 1584063.,.

The disadvantage of 8TDFO is USH9 | NIIe.a slight deterioration in the stability of the frequency of an additional non-linear element (varicap) in the live generator circuit and the complication of the circuit due to the introduction of a transistor, diode, and varicap.

Of the most well-known types of work, the technical essence is a device with an osghamshi circuit in the cu1ge G “B Altoullvra Quartz stabilization often, M Ь Siaa,, rice“ 1; "3"

In Fig. X 1fe; d01tvlvaa С9р | uk1urny scheme of this generator, which introduced the notation CJMgipqpie:

1 - thermosave potentiometer,

2- quartz pizratsr (its ahshvnaya part),

3- resistor

4-quartz §е80iator,

5- varicap.

The device by bme $ ig. 1 works as follows. The thermocouple voltage generated in the thermally dependent potentiometer I is fed through a reac- tor 3 to varicap 5 connected in series with the cavity resonator 4. The series connection of the quartz resonator @ p1 and the IC voltage are connected to the active part of generator 2.

With a change in the fusion frequency, the frequency of the quartz resonator pha 4 and the active gene gene) changes, and therefore the corresponding pattern changes to the current value through the resistor 3 to change the resistance of varicap 5 to way to -3,

the frequency deviation for the eilpt of the variation in varicap resistance was opposite to those of the departures of the quartz resonator and the active part of the generator.

The device, which is shown in FIG. 1, has high stability, economical, iplii @ KeA mechanical stability.

However, this jrcifeilftyqr has inherent disadvantages: the difficulty of generating quartz resonators and the relatively long time to establish the vibration. ivc is explained by the fact that when the generator is plugged into the generator circuit, the frequency mismatch increases and, as a result, the equivalent co1 is diminished: the photon quenching of the water crystal is varied R and the introduced losses due to 1 vntufu1yar01 e @ shpotivaniyu are completely resonant

losses

  k + R € - +

A .. X // W- (T .. / 7% T

/

R, 1 Ш.

L l / 7 -

/./ g

Xg-reactcr11 e generator social protection

 reactivity varicap

 dinantrshsv resonator resistance at Л О

Q, - to grow in v1fShEash1

 € 10 o в в «и и параллельно параллельно параллельно parallel to the quartz

It should be noted that the resistors referring to eoEffect of the static capacitance of the resonator Xo are denoted by thick letters.

In order to increase the illumination of excitation and reduce the time it takes to establish oscillations, it is necessary to reduce the value of the total loss resistance at the moment of excitation of the generator.

From vfazhazhenie (4) I see that the values of all components of the total resistance we know when reducing the reactance of the varicap -.

 - .o I / + --p- where

(5) (j is the social pressure of the varicap at -O {pp is the potential difference between the potentials, (0, 7) V. / 7 is the indicator of the maximum voltage variability of the varicaps (0.542) as a function of the varicap production theory Reactive co9B | the initial moment can be reduced by applying a circuit in which at the initial moment Eg is O, while Xg XgQ The scheme of such a device is shown in FIG. 2, where it is indicated: 1- thermally dependent potentiometer 2- active part of the generator 3- separate resistor 4-quartz resonator 5- varicap 6- resistor 7- condenoat., device with r1v | ryair of the gene} Ator 2, in which

varicap 5 Mrikash § Q & fggmm with a voltage-dependent potentiometer I through 2 at a time; up to W1maiO of connected resistors 3 and 6, a connection point of a resistor of 8% and a short circuit (low-voltage output TZH and an active capacitor of generator 7, included)

The device works in the following way:

When applied to the generator at the moment, the capacitor 7 anticipates a short contact. The voltage across the varicap 5 will be equal to lv “Thanks to this, at the initial moment of time, the reactance of the stop 5 becomes small, the detuning of the quartz resonator 4 decreases and the components M become small: and pl t and consequently i

As a result, at the initial moment of time, the values of the control resistance of the AV generator and the safety factor for its excitation increase, and, consequently, the reliability of the excitation increases and the oscillations become less in the oscillator “This effect is more in the temperature range when compensating for the coherent capacitor 5 becomes equal to the voltage value

Such connection of varic 5 does not affect the effect of thermal compensation.

Patent holder - Voronezh Research Institute of Communications.

Deputy Chief iraaeft a / I U / u- SIezhko Yu.V.

Claims (1)

A quartz oscillator containing an active part, a thermally dependent potentiometer, the first output of which is connected to the first output of the active part, a quartz resonator, the first output of which is connected to the second output of the active part, a varicap whose cathode is connected to the second output of the quartz resonator, and the anode to the first output the active part, a resistor, the first output of which is connected to the cathode of the varicap, characterized in that the second output of the resistor through the introduced additional resistor is connected to the second output of the thermally dependent potential meter, and a capacitor is connected between the common point of these resistors and the varicap anode.