GB587399A - Improvements in crystal oscillation circuits - Google Patents
Improvements in crystal oscillation circuitsInfo
- 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
Links
- 239000013078 crystal Substances 0.000 title abstract 10
- 230000010355 oscillation Effects 0.000 title abstract 2
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 abstract 3
- 235000011006 sodium potassium tartrate Nutrition 0.000 abstract 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000013016 damping Methods 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
- 230000001131 transforming effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION 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
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/34—Generation 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/542—Filters 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,
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)
| 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)
| 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 |
-
1944
- 1944-04-07 GB GB6572/44A patent/GB587399A/en not_active Expired
- 1944-04-07 FR FR903247D patent/FR903247A/en not_active Expired
- 1944-05-31 US US538142A patent/US2444998A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2444998A (en) | 1948-07-13 |
| FR903247A (en) | 1945-09-27 |
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