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Application Notes

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  Minimizing Switching Regulator Residue in Linear Regulator Outputs &mdash AN101
  PDF, 358 Kb, Language: en, File published: Jul 16, 2005, Pages: 12
  Application Note 101. Linear regulators are commonly employed to post-regulate switching regulator outputs. Benefits include improved stability, accuracy, transient response and lowered output impedance. Ideally, these performance gains would be accompanied by markedly reduced switching regulator generated ripple and spikes. In practice, all linear regulators encounter some difficulty with ripple and spikes, particularly as frequency rises. This publication explains the causes of linear regulators' dynamic limitations and presents board level techniques for improving ripple and spike rejection. A hardware based ripple/spike simulator is presented, enabling rapid breadboard testing under various conditions. Three appendices review ferrite beads, inductor based filters and probing practice for wideband, sub-millivolt signals.
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  Application Note 101
  July 2005
  Minimizing Switching Regulator Residue
  in Linear Regulator Outputs
  Banishing Those Accursed Spikes
  Jim Williams
  INTRODUCTION
  Linear regulators are commonly employed to post-regulate
  switching regulator outputs. Benefits include improved
  stability, accuracy, transient response and lowered output
  impedance. Ideally, these performance gains would be
  accompanied by markedly reduced switching regulator
  generated ripple and spikes. In practice, all linear regulators
  encounter some difficulty with ripple and spikes, particularly as frequency rises. This effect is magnified at small
  regulator VIN to VOUT differential voltages; unfortunate,
  because such small differentials are desirable to maintain
  efficiency. Figure 1 shows a conceptual linear regulator
  and associated components driven from a switching
  regulator output.
  The input filter capacitor is intended to smooth the ripple and
  spikes before they reach the regulator. The output capacitor maintains low output impedance at higher frequencies,
  improves load transient response and supplies frequency
  compensation for some regulators. Ancillary purposes include noise reduction and minimization of residual inputderived artifacts appearing at the regulators output. It is …

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  Linear Technology Magazine Circuit Collection, Volume V: Data Conversion, Interface and Signal Conditioning Products &mdash AN87
  PDF, 1.5 Mb, File published: Nov 1, 2000
  Application Note 87 is the fifth in a series that excerpts useful circuits from Linear Technology magazine. Data conversion, interface and signal conditioning circuits from issue VI:1 (February 1996) through issue VIII:4 (November 1998) are featured. Like its predecessor, AN67, this Application Note includes circuits for high speed video, interface and hot swap circuits, active RC and switched capacitor filter circuitry and a variety of data conversion and instrumentation circuits. All circuits are conveniently indexed by type.
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  Application Note 87
  November 2000 Linear Technology Magazine Circuit Collection, Volume V
  Data Conversion, Interface and Signal Conditioning Products
  Richard Markell, Editor
  INTRODUCTION
  Application Note 87 is the fifth in a series that excerpts
  useful circuits from Linear Technology magazine to preserve them for posterity. This application note highlights
  data conversion, interface and signal conditioning circuits
  from issue VI:1 (February 1996) through issue VIII:4
  (November 1998). Like its predecessor, AN67, this Application Note includes circuits for high speed video, interface and hot swap circuits, active RC and switched capacitor filter circuitry and a variety of data conversion and instrumentation circuits. There are also several circuits
  that cannot be so neatly categorized. So, without further
  ado, I’ll let the authors describe their circuits.
  Note: Article Titles appear in this application note exactly
  as they originally appeared in Linear Technology magazine. This may result in some inconsistency in the usage
  of terminology. TABLE OF CONTENTS
  Introduction . 1
  DATA CONVERTERS
  The LTC®1446 and LTC1446L: World’s First Dual 12-Bit DACs in SO-8 Packages . 3
  Multichannel A/D Uses a Single Antialiasing Filter. 4
  LTC1454/54L and LTC1458/58L: Dual and Quad 12-Bit, Rail-to-Rail, Micropower DACs . 5
  Micropower ADC and DAC in SO-8 Give PC 12-Bit Analog Interface . 7
  The LTC1594 and LTC1598: Micropower 4-and 8-Channel 12-Bit ADCs . 10
  MUX the LTC1419 Without Software . 13 …

Design Notes

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  Fast Current Feedback Amplifiers Tame Low Impedance Loads &mdash DN132
  PDF, 91 Kb, File published: Jul 1, 1996
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  Fast Current Feedback Amplifers Tame
  Low Impedance Loads – Design Note 132
  Sean Gold and William Jett
  Introduction
  Three current feedback amplifiers (CFAs) now available from Linear Technology can considerably ease
  the task of driving low impedance loads. This Design
  Note reviews the capabilities of the LTВ®1206, LT1207
  and LT1210 CFAs and addresses some design issues
  encountered when using them. These CFAs are fast
  and capable of delivering high levels of current. They
  can be readily compensated for reactive loads and are
  fully protected against thermal and short-circuit faults.
  TableВ 1 summarizes their electrical characteristics.
  Driving Transformer-Coupled Loads
  Transformer coupling is frequently used to step up
  transmission line signals. Voltage signals amplified in
  this way are not constrained by local supply voltages,
  so the amplifier’s rated current rather than its voltage
  swing usually limits the power delivered to the load.
  Amplifiers with high output current drive are therefore
  appropriate for transformer-coupled systems.
  Figure 1 shows a transformer-coupled application for
  ADSL in which an LT1210 drives a 100О© twisted pair. …

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Manufacturer's Classification

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