GB599963A - Improvements in or relating to thermionic valve oscillators - Google Patents
Improvements in or relating to thermionic valve oscillatorsInfo
- Publication number
- GB599963A GB599963A GB3173745A GB3173745A GB599963A GB 599963 A GB599963 A GB 599963A GB 3173745 A GB3173745 A GB 3173745A GB 3173745 A GB3173745 A GB 3173745A GB 599963 A GB599963 A GB 599963A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- transformer
- negative feedback
- linear
- circuit
- 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
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
Classifications
-
- 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
- H03B5/38—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator frequency-determining element being connected via bridge circuit to closed ring around which signal is transmitted
Abstract
599,963. Valve generating circuits. ERICSSON TELEPHONES, Ltd., and HOPWOOD, F. W. Nov. 24, 1945, No. 31737. [Class 40 (v)] In a thermionic valve oscillator having positive and negative feedback paths, the amount of negative feedback is controlled by a non-linear impedance which is connected across the secondary of a transformer, the primary of which is connected to the output circuit. The use of the transformer, which is arranged to step up the current through the non-linear impedance, enables the non-linear characteristic to have increased effect. Fig. 3 illustrates one form of the invention, comprising an amplifying valve V with positive feedback supplied through tuned circuit X. Negative feedback is provided in the cathode lead by means of the reflected resistance in the primary coil of transformer T arising from the non-linear resistance R connected in the secondary circuit. The resistance R may be a metal filament lamp, the resistance of which varies as the current flowing. Fig. 4 shows an oscillator circuit in which feedback is supplied through .a Wheatstone bridge network having a resonant crystal C in one arm and a transformer T coupling the non-linear resistance element R in another armof the bridge. The bridge circuit is regarded as comprising a positive and a negative feedback path, the amount of negative feedback being controlled by non-linear resistance R. A proof is given that optimum conditions obtain when alphaR0Gia = 1, where alpha is the resistance/ current slope of the non-linear resistance, Ro is the effective value of the resistance at zero current, G is the mutual conductance of the amplifier, and ia is the output current, and the use of the transformer enables this equation to be satisfied. The transformer T should have a wide frequency response and minimum phase shift. The negative feedback connection may be taken either from the primary coil of the transformer, when the turns ratio n is proved to be 1 /< 3>#alphaR0Gia, or from the secondary when the turns ratio is given as 1 /alphaR0Gia.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB599963A true GB599963A (en) | 1948-03-24 |
Family
ID=1742693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3173745A Expired GB599963A (en) | 1945-11-24 | Improvements in or relating to thermionic valve oscillators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB599963A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1003098B (en) * | 1955-11-23 | 1957-02-21 | Albin Sprenger Kom Ges | Radiosonde |
| US2839685A (en) * | 1955-05-13 | 1958-06-17 | Harvey O Riggs | Fixed frequency oscillator |
-
1945
- 1945-11-24 GB GB3173745A patent/GB599963A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2839685A (en) * | 1955-05-13 | 1958-06-17 | Harvey O Riggs | Fixed frequency oscillator |
| DE1003098B (en) * | 1955-11-23 | 1957-02-21 | Albin Sprenger Kom Ges | Radiosonde |
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