PL15744B1

PL15744B1 - The method of regulating the frequency of a piezoquartz oscillator.

Info

Publication number: PL15744B1
Application number: PL15744A
Authority: PL
Filing date: 1929-10-18
Publication date: 1932-03-31

Description

W istniejacych oscylatorach piezokwar- cowych czestotliwosc pradów stabilizowa¬ nych jest scisle okreslona wymiarami geo- metrycznemi krysztalu kwarcowego i bez zmiany tych ostatnich, jesli pominac zni¬ komo mala regulacje przez zmiane tempe¬ ratury krysztalu, zasadniczo zmieniana byc nie moze. Okolicznosc ta stwarza sze¬ reg znanych niedogodnosci.Wedlug sposobu, bedacego przedmio¬ tem wynalazku niniejszego, istnieje moz¬ nosc zmiany tej czestotliwosci na zasadzie nastepujacej.Jezeli prad o czestotliwosci F, wytwo¬ rzony przez oscylator kwarcowy, modulo¬ wac czestotliwoscia /, mniejsza od F, to, jak wiadomo, otrzyma sie trzy czestotliw)- sci modulacji: F—/, F, F+f. Eliminujac w jakikolwiek ze znanych sposobów czesto¬ tliwosc srodkowa i jedna z bocznych, otrzy¬ muje sie czestotliwosc piezokwarcu, zmniej¬ szona o dowolna czestotliwosc /. W razie, jezeli prady eliminowane nie dadza sie idealnie odfiltrowac, mozna, w celu usunie¬ cia sladów modulacji, zastosowac wzmac¬ nianie z ograniczeniem amplitudy. PLIn existing piezoquarter oscillators, the frequency of the stabilized currents is strictly defined by the geometrical dimensions of the quartz crystal, and without changing the latter, if neglecting a minor adjustment by changing the temperature of the crystal, it cannot be substantially changed. This circumstance presents a number of known drawbacks. According to the method of the present invention, it is possible to change this frequency as follows: If the current of the frequency F, produced by the quartz oscillator, modulates the frequency of /, less from F, as you know, you will get three frequencies) - modulation sci: F— /, F, F + f. By eliminating the middle frequency and one of the side frequencies in any of the known methods, the frequency of piequoquard is obtained, reduced by any frequency. In the event that the eliminated currents cannot be filtered out perfectly, you can apply amplitude-limited amplification to remove traces of modulation. PL

Claims

Patent claims. 1. L A method of controlling the frequency of a piezoquartz oscillator, characterized by the fact that the change of the frequency of the yield oscillator is made by modulating the oscillator current at the same frequency by which one wants to change x totliyflO! Sc of the Jascylatorla.

2. The method according to claim 1, characterized by the fact that the middle and one of the side frequencies are eliminated from the three frequencies of the modulated current.

3. The method according to p. 1 and 2, the significant point that if there are traces of modulation in the frequency remaining after the filtering out, the amplitudes of this current are equalized by means of an amplifier with a limited characteristic. T he technical institute. Janusz Groszkowski. Printed by L. Boguslawski and Skl, Warsaw. PL