GB841577A - Improvements in or relating to signal translating apparatus utilizing semi-conductordevices - Google Patents
Improvements in or relating to signal translating apparatus utilizing semi-conductordevicesInfo
- Publication number
- GB841577A GB841577A GB29679/56A GB2967956A GB841577A GB 841577 A GB841577 A GB 841577A GB 29679/56 A GB29679/56 A GB 29679/56A GB 2967956 A GB2967956 A GB 2967956A GB 841577 A GB841577 A GB 841577A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- input
- capacitor
- amplifier
- 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
- 239000003990 capacitor Substances 0.000 abstract 4
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
Landscapes
- Amplifiers (AREA)
Abstract
841,577. Transistor amplifying circuits. PHILCO CORPORATION. Sept. 28, 1956 [Sept. 29, 1955], No. 29679/56. Class 40(6). A gain controlled transistor amplifier comprises a parallel tuned input circuit coupled to the input electrodes of a transistor through a reactance having a high value compared with the input resistance of the transistor so that changes of input resistance of the transistor as the gain control voltage varies can be made to influence the bandwidth of the amplifier in a desired manner. The Figure shows a transistor IF amplifier comprising a tuned inter-stage coupling circuit 46 and a coupling capacitor 60 having a reactance high compared with the input resistance of the transistor 36. An AGC voltage is applied to the base electrodes of two I.F. transistors causing the input impedance to increase as the signal increases. Capacitor 60 may have such a value that the band width remains constant as the input resistance of transistor 36 changes or may provide over-compensation so that the changes of resistance of the collector 45 also do not change the band-width of the amplifier. The capacitor 60 also helps to provide an impedance match between the circuit 46 and the transistor 36. In an alternative circuit Fig. 2, not.shown, the transistor is connected in grounded emitter configuration. An inductor could be used in place of the capacitor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US841577XA | 1955-09-29 | 1955-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB841577A true GB841577A (en) | 1960-07-20 |
Family
ID=22183212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29679/56A Expired GB841577A (en) | 1955-09-29 | 1956-09-28 | Improvements in or relating to signal translating apparatus utilizing semi-conductordevices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB841577A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1616787B1 (en) * | 1962-12-21 | 1972-06-29 | Siemens Ag | FM RADIO SYSTEM FOR EQUIPMENT OF ELECTRICAL COMMUNICATION TECHNOLOGY |
-
1956
- 1956-09-28 GB GB29679/56A patent/GB841577A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1616787B1 (en) * | 1962-12-21 | 1972-06-29 | Siemens Ag | FM RADIO SYSTEM FOR EQUIPMENT OF ELECTRICAL COMMUNICATION TECHNOLOGY |
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