GB678317A - Improvements in sine wave semi-conductor oscillators - Google Patents
Improvements in sine wave semi-conductor oscillatorsInfo
- Publication number
- GB678317A GB678317A GB2367/50A GB236750A GB678317A GB 678317 A GB678317 A GB 678317A GB 2367/50 A GB2367/50 A GB 2367/50A GB 236750 A GB236750 A GB 236750A GB 678317 A GB678317 A GB 678317A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base electrode
- collector
- emitter
- resonant circuit
- earth
- 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
- 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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
-
- 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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
678,317. Semi-conductor circuits. RADIO CORPORATION OF AMERICA. Jan. 30, 1950 [Jan. 28, 1949], No. 2367/50. Classes 40 (v) and 40 (vi). An oscillator comprises a transistor, the electrodes being biased so as to provide a negative resistance between the base electrode and a point of reference potential, and a resonant circuit being connected between the base electrode and the said point. Fig. 2 shows a transistor comprising a block of semi-conducting material 1, base electrode 4, emitter electrode 2 and collector electrode 3. A parallel resonant circuit is connected between the base electrode 4 and ground, and with suitable biasing potentials applied to the emitter and collector electrodes, a negative resistance characteristic exists between the base electrode and earth, so that oscillations are produced. The output may be taken from the resonant circuit by an inductive coupling 17. A method of measuring the negative resistance between base electrode and earth is described, this characteristic being a function of the emitter bias. Alternative arrangements provide for the base electrode to be connected to a tapping on the inductance of the resonant circuit, or for the output to be taken from the collector by resistance capacity coupling. Fig. 7 shows a modification in which phase shift networks 27, 32 and 22, 33 are included in the collector and emitter circuits respectively, which allows oscillations to be produced at higher frequencies. Alternatively, a seriesresonant circuit may be connected between the collector and earth or between the emitter and earth to improve operation at higher frequencies, and the output may be taken from a coupling with the series resonant circuit. In a further arrangement, oscillations at a harmonic frequency may be produced by providing a parallel resonant circuit tuned to a harmonic frequency, in the collector circuit. Keying of the oscillator may be provided by applying signal pulses, which may be width or time modulated, to either the emitter or the base electrode, the biasing arrangement being such that these electrodes are biased in a non- conducting direction except when pulse signals are applied, so that oscillations are produced only during the occurrence of each pulse.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US678317XA | 1949-01-28 | 1949-01-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB678317A true GB678317A (en) | 1952-09-03 |
Family
ID=22078701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2367/50A Expired GB678317A (en) | 1949-01-28 | 1950-01-30 | Improvements in sine wave semi-conductor oscillators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB678317A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2775705A (en) * | 1953-06-24 | 1956-12-25 | Hartford Nat Bank & Trust Co | Transistor mixing circuit |
US2784315A (en) * | 1953-10-10 | 1957-03-05 | Hartford Nat Bank & Trust Co | Transistor pulse oscillator |
US2801338A (en) * | 1954-03-23 | 1957-07-30 | Jr John W Keller | High-sensitivity voltage-comparator circuit |
-
1950
- 1950-01-30 GB GB2367/50A patent/GB678317A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2775705A (en) * | 1953-06-24 | 1956-12-25 | Hartford Nat Bank & Trust Co | Transistor mixing circuit |
US2784315A (en) * | 1953-10-10 | 1957-03-05 | Hartford Nat Bank & Trust Co | Transistor pulse oscillator |
US2801338A (en) * | 1954-03-23 | 1957-07-30 | Jr John W Keller | High-sensitivity voltage-comparator circuit |
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