GB819511A - Improvements in or relating to electric oscillators of the kind incorporating a transistor amplifier - Google Patents
Improvements in or relating to electric oscillators of the kind incorporating a transistor amplifierInfo
- Publication number
- GB819511A GB819511A GB9786/57A GB978657A GB819511A GB 819511 A GB819511 A GB 819511A GB 9786/57 A GB9786/57 A GB 9786/57A GB 978657 A GB978657 A GB 978657A GB 819511 A GB819511 A GB 819511A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- circuit
- base
- output
- winding
- 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
- H03B5/1206—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 using multiple transistors for amplification
- H03B5/1209—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 using multiple transistors for amplification the amplifier having two current paths operating in a differential manner and a current source or degeneration circuit in common to both paths, e.g. a long-tailed pair.
-
- 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
- H03B5/1296—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 feedback circuit comprising a transformer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
819,511. Transistor oscillators. GENERAL ELECTRIC CO. Ltd. March 25, 1958 [March 25, 1957], No. 9786/57. Class 40 (6). An oscillator comprises a transistor having a resonant circuit connected in the output thereof and arranged to operate as a substantially linear amplifier throughout the oscillation cycle and a limiting circuit connected in a positive-feedback path between the output of said transistor and its input. Thus the transistor serves purely as a linear amplifier and the amplitude limitation essential to the proper functioning of the oscillator is performed in a separate part of the circuit. In the circuit illustrated a sinusoidal voltage is developed across secondary winding 10 and is applied to the base electrode of transistor 11, the base of transistor 12 being suitably biased by resistors 16, 17 but being returned to earth for alternating signals by the capacitor 18. By virtue of the common emitter resistor 13 the transistors 11 and 12 are rendered alternately conducting by the signal applied from the winding 10; thus a rectangular waveform appears at the function of resistors 14 and 15. This is applied to the emitter electrode of transistor 2 which operates as a grounded-base class A amplifier having a resonant circuit 7, 9 connected in its collector circuit. The collector electrode is connected to a tapping point on the primary winding 7, this point being so chosen as to present a low impedance to the third harmonic of the oscillation frequency as well as reducing the damping effect of the transistor 2 on the resonant circuit. The capacitor 9 may be variable or may alternatively be made temperature-sensitive to compensate for the effect of temperature upon the value of the inductance 7. Further frequency control may be provided by connecting a piezo-electric crystal in series with the resistor 20 in the feedback path. The oscillator may be modified for synchronization by disconnecting the by-pass capacitor 6, synchronizing pulses then being applied to the base of the transistor 2. A sinusoidal output is taken from the winding 21 and a rectangular-wave output from the collector electrode of transistor 12. Specification 792,418 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9786/57A GB819511A (en) | 1957-03-25 | 1957-03-25 | Improvements in or relating to electric oscillators of the kind incorporating a transistor amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9786/57A GB819511A (en) | 1957-03-25 | 1957-03-25 | Improvements in or relating to electric oscillators of the kind incorporating a transistor amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB819511A true GB819511A (en) | 1959-09-02 |
Family
ID=9878738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9786/57A Expired GB819511A (en) | 1957-03-25 | 1957-03-25 | Improvements in or relating to electric oscillators of the kind incorporating a transistor amplifier |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB819511A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1277943B (en) * | 1963-08-23 | 1968-09-19 | Siemens Ag | Circuit arrangement for generating sinusoidal voltages or currents |
| CN114362691A (en) * | 2022-03-17 | 2022-04-15 | 壹甲子(成都)通讯有限公司 | AC small signal driving information pick-up circuit |
-
1957
- 1957-03-25 GB GB9786/57A patent/GB819511A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1277943B (en) * | 1963-08-23 | 1968-09-19 | Siemens Ag | Circuit arrangement for generating sinusoidal voltages or currents |
| CN114362691A (en) * | 2022-03-17 | 2022-04-15 | 壹甲子(成都)通讯有限公司 | AC small signal driving information pick-up circuit |
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