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WO1998038773A3 - Line driver with adaptive output impedance - Google Patents

Line driver with adaptive output impedance Download PDF

Info

Publication number
WO1998038773A3
WO1998038773A3 PCT/IB1998/000128 IB9800128W WO9838773A3 WO 1998038773 A3 WO1998038773 A3 WO 1998038773A3 IB 9800128 W IB9800128 W IB 9800128W WO 9838773 A3 WO9838773 A3 WO 9838773A3
Authority
WO
WIPO (PCT)
Prior art keywords
line driver
transistor
impedance
current
output impedance
Prior art date
Application number
PCT/IB1998/000128
Other languages
French (fr)
Other versions
WO1998038773A2 (en
Inventor
Bram Nauta
Original Assignee
Koninkl Philips Electronics Nv
Philips Norden Ab
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 Koninkl Philips Electronics Nv, Philips Norden Ab filed Critical Koninkl Philips Electronics Nv
Priority to DE69834793T priority Critical patent/DE69834793T2/en
Priority to KR1019980708477A priority patent/KR100563014B1/en
Priority to EP98900646A priority patent/EP0917788B1/en
Priority to PCT/IB1998/000128 priority patent/WO1998038773A2/en
Priority to JP52922598A priority patent/JP3830534B2/en
Publication of WO1998038773A2 publication Critical patent/WO1998038773A2/en
Publication of WO1998038773A3 publication Critical patent/WO1998038773A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0278—Arrangements for impedance matching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/028—Arrangements specific to the transmitter end

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Networks Using Active Elements (AREA)

Abstract

A line driver comprising a first transistor (M1), a first amplifier (A1) and a reference resistor (10) for converting an input voltage (Vin) to a first current (i1) through the first transistor (M1). A second current i2=n*i1 flows through a second transistor (M2) which forms a 1:n current mirror with the first transistor (M1). The current (i2) flows to a load (6), if so required via a transmission line (TL). The impedance of the load (6) is equal to the characteristic impedance (RL) of the transmission line (TL). Thus the impedance seen by the line driver is equal to RL. A second transconductance amplifier (A2) counteracts reflected signals in the output signal (Vout) caused by mismatch between the output impedance of the current mirror (M1, M2) and the impedance seen by the line driver.
PCT/IB1998/000128 1997-02-25 1998-02-02 Line driver with adaptive output impedance WO1998038773A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69834793T DE69834793T2 (en) 1997-02-25 1998-02-02 LINE DRIVER WITH ADAPTIVE OUTPUT SIMPEDANCE
KR1019980708477A KR100563014B1 (en) 1997-02-25 1998-02-02 Line Driver with Adaptive Output Impedance
EP98900646A EP0917788B1 (en) 1997-02-25 1998-02-02 Line driver with adaptive output impedance
PCT/IB1998/000128 WO1998038773A2 (en) 1997-02-25 1998-02-02 Line driver with adaptive output impedance
JP52922598A JP3830534B2 (en) 1997-02-25 1998-02-02 Line driver with adaptive output impedance

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP97200526.8 1997-02-25
PCT/IB1998/000128 WO1998038773A2 (en) 1997-02-25 1998-02-02 Line driver with adaptive output impedance

Publications (2)

Publication Number Publication Date
WO1998038773A2 WO1998038773A2 (en) 1998-09-03
WO1998038773A3 true WO1998038773A3 (en) 1998-11-26

Family

ID=11004665

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1998/000128 WO1998038773A2 (en) 1997-02-25 1998-02-02 Line driver with adaptive output impedance

Country Status (1)

Country Link
WO (1) WO1998038773A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6665399B1 (en) 1999-03-25 2003-12-16 Nortel Networks Limited High-efficiency line driver
US6275078B1 (en) * 2000-02-04 2001-08-14 Stmicroelectronics, Inc. Self-adjustable impendance line driver

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002931A1 (en) * 1993-07-14 1995-01-26 Philips Electronics N.V. Line driver with adaptive output impedance
US5585763A (en) * 1995-03-30 1996-12-17 Crystal Semiconductor Corporation Controlled impedance amplifier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995002931A1 (en) * 1993-07-14 1995-01-26 Philips Electronics N.V. Line driver with adaptive output impedance
US5585763A (en) * 1995-03-30 1996-12-17 Crystal Semiconductor Corporation Controlled impedance amplifier

Also Published As

Publication number Publication date
WO1998038773A2 (en) 1998-09-03

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