GB1002632A - Electrical signal amplifier - Google Patents
Electrical signal amplifierInfo
- Publication number
- GB1002632A GB1002632A GB4872262A GB4872262A GB1002632A GB 1002632 A GB1002632 A GB 1002632A GB 4872262 A GB4872262 A GB 4872262A GB 4872262 A GB4872262 A GB 4872262A GB 1002632 A GB1002632 A GB 1002632A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- supply
- emitter
- 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 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
- H03F3/387—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
1,002,632. Transistor amplifiers. ADAGE Inc. Dec. 27, 1962, No. 48722/62. Heading H3T. The invention relates to supply arrangements for D.C. amplifiers and more particularly for amplifiers having a high input impedance. A basic circuit arrangement according to the invention is illustrated in Fig. 1, in which input signals are applied through a network 24 to a D.C. amplifier 28 feeding a transistor output stage 34 having a constant current emitter supply, the circuit having common input, output and supply terminals 12, 16 and 18 and a D.C. supply for the amplifier comprising two stabilized voltage sources 44 and 46 with a common point connected to an output terminal 14. Fig. 2 shows more details of this circuit. The input terminal 10 is connected to a main D.C. amplifier 28 through an A.C. path comprising capacitor 50 and through a chopper type D.C. amplifier 60, 66 described later. The output from the main amplifier 28 is fed to a transistor 34 having output terminal 14 connected to its emitter. The emitter supply is obtained from a constant current source 38 formed from a transistor 88 having a constant current emitter supply provided from a Zener diode 90 and resistor 96. The collector-emitter voltage of transistor 34 is maintained constant by a series transistor 80 operated as an emitter follower with its base coupled through a constant voltage source 86 to the emitter of transistor 34. This constant voltage source comprises a 10-volt Zener diode fed with a constant current supply from a source 84. The constant 10 volts with reference to the emitter of transistor 34 which exists at the emitter of transistor 80 is used as a supply voltage for circuits 60, 64 and 28. A five-volt Zener diode 76 reduces this ten volts to five volts and this is used as a supply for amplifier 28. A multivibrator 64 operates a chopper 62 and a demodulator 66, the chopper being connected in a negative feedback path from output terminal 14 to the input terminal. When the transistor 34 has to operate from a higher voltage supply, further transistors may be added between the battery 22 and transistor 80 (Fig. 3, not shown). A diode 118 prevents false operation of the amplifier when the load is capacitive and a feedback circuit 120 improves the stability of the circuit. In addition overall feedback may be provided, for example, to make the circuit into an "operational" amplifier (Figs. 4 and 5, not shown).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4872262A GB1002632A (en) | 1962-12-27 | 1962-12-27 | Electrical signal amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4872262A GB1002632A (en) | 1962-12-27 | 1962-12-27 | Electrical signal amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1002632A true GB1002632A (en) | 1965-08-25 |
Family
ID=10449677
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4872262A Expired GB1002632A (en) | 1962-12-27 | 1962-12-27 | Electrical signal amplifier |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1002632A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011101662A1 (en) | 2010-02-16 | 2011-08-25 | Im-Sense Ltd | Method and system for generating enhanced images |
-
1962
- 1962-12-27 GB GB4872262A patent/GB1002632A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011101662A1 (en) | 2010-02-16 | 2011-08-25 | Im-Sense Ltd | Method and system for generating enhanced images |
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