GB666813A - Improvements in or relating to generators of high frequency electrical signals of rectangular waveform - Google Patents
Improvements in or relating to generators of high frequency electrical signals of rectangular waveformInfo
- Publication number
- GB666813A GB666813A GB2280649A GB2280649A GB666813A GB 666813 A GB666813 A GB 666813A GB 2280649 A GB2280649 A GB 2280649A GB 2280649 A GB2280649 A GB 2280649A GB 666813 A GB666813 A GB 666813A
- Authority
- GB
- United Kingdom
- Prior art keywords
- anode
- diode
- pentode
- cathode
- control grid
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
- Electrostatic Separation (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
666,813. Valve circuits. GENERAL ELECTRIC CO., Ltd. Aug. 28, 1950 [Sept. 2, 1949], No. 22806/49. Class 40 (vi). A rectangular waveform generator comprises a pentode type valve having its anode and control grid connected via resistors to H.T.+ and its cathode connected to H.T. -, a diode is connected with its anode to the control grid of the pentode valve and first and second signals of the same waveform are applied to the cathode and anode of the diode respectively, the second signal being such that it neutralizes any part of the first signal which appears at the diode anode due to its inter-electrode capacity, and in this way the generator operates effectively at a high pulse repetition frequency. The Figure shows a generator in which a sinusoidal voltage having a frequency equal to the required P.R.F. is applied from an input 15 to a circuit 8, 9 which is resonant at the same frequency. Any part of the signal passed to the anode of diode 7 via the cathode/anode inter-electrode capacity is neutralized by capacitor 10. The pentode 1 is normally conducting due to its slightly positive control grid potential but during the negative portions of the sinusoidal voltage at the cathode of diode 7 the diode conducts, the control grid of pentode 1 drops rapidly to cut-off its anode potential then rising until after the sinusoidal voltage has passed through its minimum value and is rising, diode 7 is rendered non-conducting again, pentode 1 conducts and its anode voltage falls, the cycle then being repeated. Tapping 11 on inductor 8 is preferably connected to the mid-point of the inductor, thereby giving the minimum effective input capacity at the control grid of pentode 1. The " mark-space ratio " of the rectangular wave may be altered by varying the voltage of the cathode of diode 7 relative to that of the cathode of the pentode 1. The circuit may be used as a pulse shortening circuit by applying a pulse to the input 15 so that the resonant circuit 8, 9 " rings " but is so damped that only the first cycle of the damped waveform operates the generator. The rectangular waveform output may be integrated to produce a saw-tooth waveform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2280649A GB666813A (en) | 1949-09-02 | 1949-09-02 | Improvements in or relating to generators of high frequency electrical signals of rectangular waveform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2280649A GB666813A (en) | 1949-09-02 | 1949-09-02 | Improvements in or relating to generators of high frequency electrical signals of rectangular waveform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB666813A true GB666813A (en) | 1952-02-20 |
Family
ID=10185349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2280649A Expired GB666813A (en) | 1949-09-02 | 1949-09-02 | Improvements in or relating to generators of high frequency electrical signals of rectangular waveform |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB666813A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041080B (en) * | 1954-06-10 | 1958-10-16 | Siemens Ag | Frequency stable square wave generator |
-
1949
- 1949-09-02 GB GB2280649A patent/GB666813A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041080B (en) * | 1954-06-10 | 1958-10-16 | Siemens Ag | Frequency stable square wave generator |
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