GB587399A - Improvements in crystal oscillation circuits - Google Patents

Improvements in crystal oscillation circuits

Info

Publication number
GB587399A
GB587399A GB6572/44A GB657244A GB587399A GB 587399 A GB587399 A GB 587399A GB 6572/44 A GB6572/44 A GB 6572/44A GB 657244 A GB657244 A GB 657244A GB 587399 A GB587399 A GB 587399A
Authority
GB
United Kingdom
Prior art keywords
crystal
voltage
temperature
frequency
curie
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6572/44A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Patelhold Patenverwertungs and Elektro-Holding AG
Original Assignee
Patelhold Patenverwertungs and Elektro-Holding AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patelhold Patenverwertungs and Elektro-Holding AG filed Critical Patelhold Patenverwertungs and Elektro-Holding AG
Publication of GB587399A publication Critical patent/GB587399A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46Filters
    • H03H9/54Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/545Filters comprising resonators of piezoelectric or electrostrictive material including active elements
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03BGENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/34Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being vacuum tube
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46Filters
    • H03H9/54Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/542Filters comprising resonators of piezoelectric or electrostrictive material including passive elements

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

587,399. Valve generating circuits ; impedance networks. PATELHOLD PATENT VERWERTUNGS- & ELEKTROHOLDING AKT.-GES. April 7, 1944, No. 6572. Convention date, April 12, 1943. [Classes 40 (iii) and 40 (v)] Damping is reduced in a piezo-electric crystal composed of Rochelle salt by subjecting the crystal to a D.C. or A.C. voltage of such magnitude that the crystal is worked outside the range in which the polarization/voltage characteristic exhibits hysteresis. In a crystalcontrolled oscillator, Fig. 2, in which the reaction coupling is provided by the inter - electrode capacity 5, a D.C. voltage is applied at 4, 4 through chokes 3, 3, so as to produce a field of 900 v./cm. or more across a Rochellesalt crystal 1. The temperature is controlled at a value, between the Curie points, at which dielectric losses in the crystal are at a minimum. Similarly, voltage from batteries 4, 4, Fig. 3, may be applied to Rochelle-salt crystals 1, 1 in a filter. The D.C. voltage may be obtained by transforming and rectifying high-frequency oscillations and may be stabilized. The natural frequency of each crystal depends upon the D.C. voltage applied to it and also on the amplitude of the A.C. component. If the latter is used for tuning the crystal, the temperature may be near one, preferably the higher, of the Curie points, in, order that the frequency may change rapidly with changes of voltage. Alternatively, the frequency may be varied by varying the temperature, but it changes only slowly with temperature if the strength of the field applied to the crystal exceeds 1400 v./cm. or if the temperature is at a Curie point or at the minimum point between the Curie points,
GB6572/44A 1943-04-12 1944-04-07 Improvements in crystal oscillation circuits Expired GB587399A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH587399X 1943-04-12

Publications (1)

Publication Number Publication Date
GB587399A true GB587399A (en) 1947-04-24

Family

ID=4521893

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6572/44A Expired GB587399A (en) 1943-04-12 1944-04-07 Improvements in crystal oscillation circuits

Country Status (3)

Country Link
US (1) US2444998A (en)
FR (1) FR903247A (en)
GB (1) GB587399A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471085A (en) * 1947-06-28 1949-05-24 Sinclair Refining Co Fluid catalyst process for the conversion of hydrocarbons
US2702427A (en) * 1948-03-13 1955-02-22 Roberts Shepard Method of making electromechanically sensitive material
US2878454A (en) * 1953-09-03 1959-03-17 Motorola Inc Piezoelectric crystal filter
US2939089A (en) * 1958-01-06 1960-05-31 Philco Corp Signal generating circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1996504A (en) * 1933-04-12 1935-04-02 Bell Telephone Labor Inc Wave filter
US1994220A (en) * 1934-01-03 1935-03-12 Hormel August Metal sheet drying oven
US2306555A (en) * 1940-05-23 1942-12-29 Research Corp Method for frequency control

Also Published As

Publication number Publication date
US2444998A (en) 1948-07-13
FR903247A (en) 1945-09-27

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