GB679888A - Improvements in or relating to crystal filter circuits - Google Patents
Improvements in or relating to crystal filter circuitsInfo
- Publication number
- GB679888A GB679888A GB1756950A GB1756950A GB679888A GB 679888 A GB679888 A GB 679888A GB 1756950 A GB1756950 A GB 1756950A GB 1756950 A GB1756950 A GB 1756950A GB 679888 A GB679888 A GB 679888A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- crystal
- electric
- crystal filter
- earthed
- 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 4
- 239000004020 conductor Substances 0.000 abstract 2
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 238000012216 screening Methods 0.000 abstract 1
- 238000004804 winding Methods 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 elements; 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)
Abstract
679,888. Electric filters. GENERAL ELECTRIC CO., Ltd., and SIMPSON, A. I. F. June 6, 1951 [July 13, 1950], No. 17569/50. Class 40 (viii). In a crystal filter circuit including a bridge circuit having in adjacent arms a piezo-electric crystal 4 and a capacity 5, the input to the circuit being applied between the ends A and C of the arms remote from their junction D and the output being taken across the other diagonal B, D of the bridge, a high resistance 7 is connected in parallel with the condenser 5. This increases considerably the attenuation of a signal at the parallel resonance frequency of the crystal. The latter may be mounted in a separate earthed screening compartment, and the windings of the input transformer may also be similarly mounted. The connections between the two halves of the bridge are made through the inner conductors of coaxial lines 9 and 10 the outer conductors of which are earthed. A differential adjustable condenser 8 is provided to allow adjustment to eliminate an interfering signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1756950A GB679888A (en) | 1950-07-13 | 1950-07-13 | Improvements in or relating to crystal filter circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1756950A GB679888A (en) | 1950-07-13 | 1950-07-13 | Improvements in or relating to crystal filter circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB679888A true GB679888A (en) | 1952-09-24 |
Family
ID=10097483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1756950A Expired GB679888A (en) | 1950-07-13 | 1950-07-13 | Improvements in or relating to crystal filter circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB679888A (en) |
-
1950
- 1950-07-13 GB GB1756950A patent/GB679888A/en not_active Expired
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