GB973753A - Improvements in or relating to cathode-follower and emitterfollower circuits - Google Patents

Improvements in or relating to cathode-follower and emitterfollower circuits

Info

Publication number
GB973753A
GB973753A GB30279/61A GB3027961A GB973753A GB 973753 A GB973753 A GB 973753A GB 30279/61 A GB30279/61 A GB 30279/61A GB 3027961 A GB3027961 A GB 3027961A GB 973753 A GB973753 A GB 973753A
Authority
GB
United Kingdom
Prior art keywords
emitter
follower
cathode
collector
transistor
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
Application number
GB30279/61A
Inventor
Kathirkamathamby Kandiah
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to NL282327D priority Critical patent/NL282327A/xx
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB30279/61A priority patent/GB973753A/en
Priority to DEU9204A priority patent/DE1186512B/en
Priority to FR907423A priority patent/FR1331817A/en
Priority to US218653A priority patent/US3163827A/en
Publication of GB973753A publication Critical patent/GB973753A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F5/00—Amplifiers with both discharge tubes and semiconductor devices as amplifying elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3083—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the power transistors being of the same type

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

973,753. Cathode follower and emitter follower circuits. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. Aug. 16, 1962 [Aug. 22, 1961; Dec. 13, 1961], Nos. 30279/61 and 44703/61. Headings H3T and H3W. In a cathode follower or emitter follower the effective load in the cathode or emitter circuit comprises a transistor J2, Fig. 5, having its collector connected to the base of a further transistor J3, the emitter of which is connected to the base of J2 whilst the output connection is taken from the emitter of J3. This arrangement reduces the output impedance and causes the voltage gain to approach unity. As shown in Fig. 5, changes in emitter current of the emitter follower J1 are fed to transistor J2, the collector load of which is a constant current circuit formed by J4, R7. Negative feedback is provided via J3. The Zener diode D ensures that the voltage between the collector and emitter of J1 remains constant. The integrating circuits R3, C1 stabilizes the system, it is also necessary to use as J2 a transistor with a cut-off frequency much higher than that of J1 and J3. In Fig. 4 (not shown), J4 is omitted and the Zener diode D is replaced by a resistor. In Fig. 6 (not shown), transistors J2, J3 are both of the NPN type and are connected between the positive line E1 and the emitter of J1 Fig. 3 shows the invention applied to a cathode follower V1 having a constant current circuit formed by J5 and R12. Changes in cathode current are fed to J2<SP>1</SP> having negative feedback via J3<SP>1</SP>. The anode-cathode potential is maintained constant by the gas discharge tube V2. Overswing is prevented when feeding a capacitive load by C2<SP>1</SP>, R15<SP>1</SP>. Alternatively an integrating circuit as shown in Fig. 5 may be connected in series with the grid. Expressions are given for voltage gain and for output impedance. The input capacitance may be smaller than 1 pF, particularly if shields are connected to the output instead of to earth. Balanced emitter follower circuits.-Fig. 8 shows two circuits according to the invention feeding a loud-speaker RL. The base-emitter path of a transistor J4<SP>1</SP> is included in the collector circuit of the main emitter follower J1. By connecting the collector of J4<SP>1</SP> to the load, the load voltage can rise to within 0.5V of the supply voltage E3. Constant current collector loads I3, I33 are provided for transistors J2, J22.
GB30279/61A 1961-08-22 1961-08-22 Improvements in or relating to cathode-follower and emitterfollower circuits Expired GB973753A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL282327D NL282327A (en) 1961-08-22
GB30279/61A GB973753A (en) 1961-08-22 1961-08-22 Improvements in or relating to cathode-follower and emitterfollower circuits
DEU9204A DE1186512B (en) 1961-08-22 1962-08-21 Circuit arrangement for adapting a high-resistance signal voltage source to a low-resistance consumer
FR907423A FR1331817A (en) 1961-08-22 1962-08-21 Cathode Coupled and Emitter Coupled Circuits Enhancements
US218653A US3163827A (en) 1961-08-22 1962-08-22 Cathode-follower and emitter-follower circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30279/61A GB973753A (en) 1961-08-22 1961-08-22 Improvements in or relating to cathode-follower and emitterfollower circuits

Publications (1)

Publication Number Publication Date
GB973753A true GB973753A (en) 1964-10-28

Family

ID=10305132

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30279/61A Expired GB973753A (en) 1961-08-22 1961-08-22 Improvements in or relating to cathode-follower and emitterfollower circuits

Country Status (4)

Country Link
US (1) US3163827A (en)
DE (1) DE1186512B (en)
GB (1) GB973753A (en)
NL (1) NL282327A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2636156A1 (en) * 1975-08-12 1977-02-17 Tokyo Shibaura Electric Co VOLTAGE FOLLOW-UP

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268828A (en) * 1962-11-02 1966-08-23 Burroughs Corp Amplifier with constant amplitude output
US3296540A (en) * 1963-05-07 1967-01-03 John C May Transistor back bias
US3421102A (en) * 1965-06-10 1969-01-07 Tektronix Inc Direct coupled temperature compensated amplifier
US3451001A (en) * 1966-08-15 1969-06-17 Bunker Ramo D.c. amplifier
US3543173A (en) * 1969-01-21 1970-11-24 Bendix Corp Class b power amplifier
JPS5150550A (en) * 1974-10-29 1976-05-04 Tokyo Shibaura Electric Co Fet zofukukairo

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2636156A1 (en) * 1975-08-12 1977-02-17 Tokyo Shibaura Electric Co VOLTAGE FOLLOW-UP

Also Published As

Publication number Publication date
DE1186512B (en) 1965-02-04
US3163827A (en) 1964-12-29
NL282327A (en)

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