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Design Notes

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  ADSL Modems That Use the LT1886 As a Line Driver Yield Long Reach and Fast Data Rates &mdash DN240
  PDF, 76 Кб, Файл опубликован: 5 сен 2001
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  ADSL Modems That Use the LT1886 As a Line Driver Yield
  Long Reach and Fast Data Rates
  Design Note 240
  Tim Regan
  ADSL technology allows for communication to a remote
  internet server at data rates nearing 1Mbit/sec, nearly
  twenty times faster than conventional modems, over
  normal telephone wiring with a reach of up to 18,000
  feet. A key component in making this happen is the
  power amplifier used to drive the encoded data signal
  on to the phone line. Ideally the line driver must not
  introduce any distortion of the transmitted signal.
  This allows the system to maximize the data rate over
  the longest wiring reach possible by using all of the
  available carrier tones for the data transmission. The
  LTВ®1886 line driver outputs undistorted broadband
  power into the telephone network.
  The LT1886 also maintains very low distortion even
  when configured for high levels of closed-loop gain.
  Low supply voltage VLSI digital circuits used to provide
  the encoded data require significant voltage gain to be
  taken in the line driver without introducing distortion.
  LT1886: Low Distortion Line Driver …

Статьи

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  ADSL Line Driver Design Guide, Part 2 &mdash LT Journal
  PDF, 239 Кб, Файл опубликован: 1 май 2000
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  DESIGN IDEAS ADSL Line Driver Design Guide, Part 2
  by Tim Regan
  Part one of this article appeared in
  Linear Technology X:1 (February 2000)
  and is also available on the
  LinearвђЈ T echnology web site at
  www.lineartech.com/ezone/dsl.html.
  It discusses the different DSL standards, characteristics of the DSL
  signals, the design of differential drivers for DSL and the requirements for
  amplifiers used in this application. Design Calculations, Volts,
  Amps and Power Dissipation
  It is very important to consider the
  power requirements of the line driver
  in DSL applications. Although a nominal power level of 100mWRMS or less
  into a 100Ω load does not seem to be
  a lot of power, the driver must handle
  large peak signals and therefore
  requires a larger than nominal power
  supply voltage. This increases both
  the power dissipation in the driver
  package and the peak current capability needed from the power supply.
  This issue becomes most critical in
  central office designs, where many …

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Классификация производителя

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Speed Amplifiers (GBW > 50MHz) | High Output Current Amplifiers (>100mA) | High Voltage Amplifiers (>12V)