FI19992766A - Emitteruppföljare - Google Patents

Emitteruppföljare

Info

Publication number
FI19992766A
FI19992766A FI992766A FI19992766A FI19992766A FI 19992766 A FI19992766 A FI 19992766A FI 992766 A FI992766 A FI 992766A FI 19992766 A FI19992766 A FI 19992766A FI 19992766 A FI19992766 A FI 19992766A
Authority
FI
Finland
Prior art keywords
current
transistor
emitter follower
load
running
Prior art date
Application number
FI992766A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI108378B (en
Inventor
Tero Sillanpaeae
Original Assignee
Micro Analog Syst Oy
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
Application filed by Micro Analog Syst Oy filed Critical Micro Analog Syst Oy
Priority to FI992766A priority Critical patent/FI108378B/en
Priority to AT00987550T priority patent/ATE343247T1/en
Priority to EP00987550A priority patent/EP1260018B1/en
Priority to AU23800/01A priority patent/AU2380001A/en
Priority to PCT/FI2000/001131 priority patent/WO2001047104A1/en
Priority to DE60031445T priority patent/DE60031445D1/en
Publication of FI19992766A publication Critical patent/FI19992766A/en
Application granted granted Critical
Publication of FI108378B publication Critical patent/FI108378B/en

Links

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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/301—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in MOSFET amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
    • H03F3/505—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with field-effect devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Primary Cells (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Abstract

The invention relates to an emitter follower, to which a current is supplied through a biasing means (RB), the current being divided in the emitter into a load current (I3) and a current (I2) running through a transistor, and the current (I2) passed through the transistor (Q1) creates a parasitic pole in the frequency domain. According to the invention, a control loop is generated, which controls the first current running through the biasing means (RB) in such a manner that the collector current (I2) of the transistor (Q1) remains substantially at a constant value regardless of variation in the load current (I3). When this constant value is selected in such a manner that the corresponding parasitic pole is outside the desired operating frequency range, the emitter follower or the electronic circuit in which it is used, is frequency-stable at all load current values, and the circuit can, when required, supply even high load circuits (I3) without changing the bias current (I2) of the emitter follower.
FI992766A 1999-12-22 1999-12-22 emitter FI108378B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FI992766A FI108378B (en) 1999-12-22 1999-12-22 emitter
AT00987550T ATE343247T1 (en) 1999-12-22 2000-12-21 EMITTER FOLLOWERS WITH MEANS FOR POLARIZING TO A CONSTANT COLLECTOR CURRENT
EP00987550A EP1260018B1 (en) 1999-12-22 2000-12-21 Emitter follower with constant collector current biasing means
AU23800/01A AU2380001A (en) 1999-12-22 2000-12-21 Emitter follower with constant collector current biasing means
PCT/FI2000/001131 WO2001047104A1 (en) 1999-12-22 2000-12-21 Emitter follower with constant collector current biasing means
DE60031445T DE60031445D1 (en) 1999-12-22 2000-12-21 EMITTER FOLDER WITH MEANS TO POLARIZE ON A CONSTANT COLLECTOR CURRENT

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI992766A FI108378B (en) 1999-12-22 1999-12-22 emitter
FI992766 1999-12-22

Publications (2)

Publication Number Publication Date
FI19992766A true FI19992766A (en) 2001-06-23
FI108378B FI108378B (en) 2002-01-15

Family

ID=8555799

Family Applications (1)

Application Number Title Priority Date Filing Date
FI992766A FI108378B (en) 1999-12-22 1999-12-22 emitter

Country Status (6)

Country Link
EP (1) EP1260018B1 (en)
AT (1) ATE343247T1 (en)
AU (1) AU2380001A (en)
DE (1) DE60031445D1 (en)
FI (1) FI108378B (en)
WO (1) WO2001047104A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8302902A (en) * 1983-08-18 1985-03-18 Philips Nv TRANSISTOR PROTECTION CIRCUIT.
US4751404A (en) * 1986-10-31 1988-06-14 Applied Micro Circuits Corporation Multi-level ECL series gating with temperature-stabilized source current
US4847566A (en) * 1988-02-09 1989-07-11 Linear Technology Corporation CMOS Amplifier having enhanced current sinking and capacitance load drive
US5281873A (en) * 1989-11-21 1994-01-25 Fujitsu Limited Sense amplifier control circuit
DE19616443A1 (en) * 1996-04-25 1997-10-30 Cafer Borucu Push=pull end stage device for analogue and digital circuit e.g. AND=gate

Also Published As

Publication number Publication date
EP1260018B1 (en) 2006-10-18
ATE343247T1 (en) 2006-11-15
EP1260018A1 (en) 2002-11-27
AU2380001A (en) 2001-07-03
DE60031445D1 (en) 2006-11-30
WO2001047104A1 (en) 2001-06-28
FI108378B (en) 2002-01-15

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Legal Events

Date Code Title Description
MM Patent lapsed