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LTC3400B

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• Herunterladen
  Slew Rate Verification for Wideband Amplifiers: The Taming of the Slew &mdash AN94
  PDF, 594 Kb, Datei veröffentlicht: May 1, 2003
  Wideband amplifiers achieve slew rates beyond 2500V/µs. Verifying slew rates at this speed requires special techniques. In particular, a subnanosecond rise time input step is necessary for accurate slew rate measurement. A pulse generator with a 360 picosecond rise time is shown, and its construction detailed. Slew rate test results using this generator are presented and compared to data taken with slower rise time generators. Appendices cover high speed measurement technique, generator output level shifting and picosecond signal path construction considerations.
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  Application Note 94
  May 2003
  Slew Rate Verification for Wideband Amplifiers
  The Taming of the Slew
  Jim Williams
  INTRODUCTION
  Slew rate defines an amplifier’s maximum rate of output
  excursion. This specification sets limits on undistorted
  bandwidth, an important capability in A/D driver applications. Slew rate also influences achievable performance in
  D/A output stages, filters, video amplification and data
  acquisition. Because of its importance, amplifier slew rate
  must be verified by measurement. Deriving a measurement approach requires understanding slew rate’s relationship to amplifier dynamics. total elapsed time from input application until the output
  arrives at and remains within a specified error band
  around the final value is the settling time.1 Amplifier Dynamic Response Historically, slew rate measurement has been relatively
  simple.2 Early amplifiers had slew rates of typically 1V/Вµs,
  with later versions sometimes reaching hundreds of
  volts/Вµs. Standard laboratory pulse generators easily supplied rise times well beyond amplifier speeds. As slew rates
  have crossed 1000V/µs, the pulse generator’s finite rise
  time has become a concern. A recent device, the LT1818
  (See Box Section, “A 2500V/µs Slew Rate Amplifier with Figure 1 shows that amplifier dynamic response components include delay, slew and ring times. The delay time is
  small and is almost entirely due to amplifier propagation
  delay. During this interval there is no output movement.
  During slew time the amplifier moves at its highest …

Artikel

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  1.2MHz ThinSOT Boost Converter Operates from a Single Cell, Saves Board Space and Delivers 93% Efficiency &mdash LT Journal
  PDF, 175 Kb, Datei veröffentlicht: Sep 1, 2001
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  DESIGN FEATURES 1.2MHz ThinSOT Boost Converter
  Operates from a Single Cell,
  Saves Board Space and
  by John Bazinet
  Delivers 93% Efficiency
  Introduction
  Many portable handheld electronic
  devices require small, high efficiency
  power converter solutions to extend
  the time between recharge cycles or
  battery replacement. Linear Technology’s new LTC3400 family of
  products address this need by integrating a fixed frequency, internally
  compensated, synchronous boost
  converter in a 3mm Г— 3mm Г— 1mm
  ThinSOT package. The 1.2MHz
  switching frequency and built-in features minimize the solution footprint
  and enable the use of tiny, low profile
  inductors and ceramic capacitors.
  With the ThinSOT package and a
  few external components, a complete, 90% efficient, single-cell to 3.3V/
  150mA converter occupies only 7mm
  Г— 9mm of precious board real estate.
  Efficiencies as high as 93% can be …

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Herstellerklassifikation

• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Micropower Boost | Internal Power Switch Boost