GB873786A - Improvements in or relating to electric oscillators - Google Patents
Improvements in or relating to electric oscillatorsInfo
- Publication number
- GB873786A GB873786A GB26321/58A GB2632158A GB873786A GB 873786 A GB873786 A GB 873786A GB 26321/58 A GB26321/58 A GB 26321/58A GB 2632158 A GB2632158 A GB 2632158A GB 873786 A GB873786 A GB 873786A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- transistor
- output
- input
- amplifier
- 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
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/36—Amplitude modulation by means of semiconductor device having at least three electrodes
-
- 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
- H03B5/1221—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 comprising multiple amplification stages connected in cascade
-
- 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
- H03B5/1296—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)
- Amplitude Modulation (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
873,786. Automatic volume control. GENERAL ELECTRIC CO. Ltd. Aug. 5, 1959 [Aug. 15, 1958], No. 26321/58. Class 40 (4). [Also in Group XL (c)] A unidirectional amplitude modulation input at 1, 2 to an oscillator 25, 11, 12 is interrupted at oscillator frequency, in a shunt modulator 5 short-circuiting the input, by a feed-back path 23, 24, from the output of the oscillator to the modulator, of phase such that oscillations are generated and sustained. The modulator 5 may be a transistor, as shown, and the oscillator feed-back to its base shunted by a rectifier 29 to prevent positive excursions of the feed-back frequency causing reverse conduction in the transistor. The carrier interrupted modulation may then be amplified by a transistor amplifier 25, 11, 12 with Class B output stage and Zener diode 19 stabilizing the operating voltage. Alternatively the modulator may be a ring modulator series connected in the modulation input circuit. Negative feed-back may be applied by an R-C circuit from the amplifier output to the emitter of transistor 25 or by adding a rectified portion of the output in series with the input 1, 2. The amplifier output may be rectified so that it forms a D.C. amplifier. The phase of the feed-back reverses with the polarity of the unidirectional input at 1, 2 but the amplifier may have a phase/frequency and gain/frequency characteristic such that oscillation takes place at a different frequency producing a further 180 degree phase shift in the amplifier. The oscillator operates only for a minimum input at 1, 2 dependent on the temperature of transistor 5, but this minimum may be reduced by connecting the base of transistor 5 through a resistor to the negative operating voltage to bias it by an input current. The oscillator may be employed in a carrier telephony system with a pilot carrier transmitted for determining the attenuation of a network through which one or more signalling channels passes, the pilot amplitude being rectified and its difference from a reference voltage being used to control the output of an oscillator as above described whose output energizes the heater of a thermistor forming part of the attenuation network. A constant level of amplitude of the signals may thus be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB26321/58A GB873786A (en) | 1958-08-15 | 1958-08-15 | Improvements in or relating to electric oscillators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB26321/58A GB873786A (en) | 1958-08-15 | 1958-08-15 | Improvements in or relating to electric oscillators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB873786A true GB873786A (en) | 1961-07-26 |
Family
ID=10241815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26321/58A Expired GB873786A (en) | 1958-08-15 | 1958-08-15 | Improvements in or relating to electric oscillators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB873786A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8179935B2 (en) | 2008-04-01 | 2012-05-15 | Hewlett-Packard Development Company, L.P. | Tunable optical resonator |
-
1958
- 1958-08-15 GB GB26321/58A patent/GB873786A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8179935B2 (en) | 2008-04-01 | 2012-05-15 | Hewlett-Packard Development Company, L.P. | Tunable optical resonator |
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