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Notas de aplicación

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  Signal Sources, Conditioners and Power Circuitry Circuits of the Fall, 2004 &mdash AN98
  PDF, 886 Kb, Archivo publicado: nov 19, 2004
  Eighteen circuits are presented in this compilation. Signal sources include a voltage controlled current source, an amplitude/frequency stabilized sine wave oscillator, a versatile, 0V to 50V wideband level shift and four sub-nanosecond pulse generators with risetimes as low as 20ps. Five signal conditioners appear; a unique, single positive rail powered amplifier with output to (and below) zero volts, a milliohmmeter, a 0.02% accurate instrumentation amplifier with 120dB CMRR at 125VCM, a 100MHz switch with 5mV control channel feedthrough and a 5V powered, 15ppm linearity quartz stabilized V→F, converter. The power circuits section features a Xenon flashlamp supply, two 5V powered, 0V to 300V DC/DC converters, a fixed 200V output circuit for APD bias, a 100W 0V to 500V, 28V powered converter and a high current paralleling scheme for linear regulators. Two appended sections consider measurement technique and connection practice in sub-nanosecond circuits.
  Extracto del documento

  Application Note 98
  November 2004
  Signal Sources, Conditioners and Power Circuitry
  Circuits of the Fall, 2004
  Jim Williams
  Introduction
  Occasionally, we are tasked with designing circuitry for a
  specific purpose. The request may have customer origins
  or it may be an in-house requirement. Alternately, a circuit
  may be developed because its possibility is simply too
  attractive to ignore1. Over time, these circuits accumulate,
  encompassing a wide and useful body of proven capabilities. They also represent substantial effort. These considerations make publication an almost obligatory proposition
  and, as such, a group of circuits is presented here. This is
  not the first time we have displayed such wares and, given
  the encouraging reader response, it will not be the last2.
  Eighteen circuits are included in this latest effort, roughly
  arranged in the categories given in this publication’s title.
  They appear at the next paragraph.
  Voltage Controlled Current Source—Ground Referred
  Input and Output
  A voltage controlled current source with ground referred
  input and output is difficult to achieve. Executions exist,
  but are often cumbersome, involving numerous components. Figure 1’s conceptual design utilizes a differential …

Notas de Diseño

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  Video Difference Amplifier Brings Versatility to Low Voltage Applications &mdash DN343
  PDF, 88 Kb, Archivo publicado: agosto 1, 2004
  Extracto del documento

  Video Difference Amplifier Brings Versatility
  to Low Voltage Applications – Design Note 343
  Jon Munson
  Introduction
  The LTВ®6552 is a specialized dual-differencing 75MHz
  operational amplifier ideal for rejecting common mode
  noise as a video line receiver. The input pairs are designed to operate with equal but opposite large-signal
  differences and provide exceptional high frequency common mode rejection (CMRR of 65dB at 10MHz), thereby
  forming an extremely versatile gain block structure that
  minimizes component count in most situations. The
  dual input pairs are free to take on independent common mode levels, while the two voltage differentials
  are summed internally to form a net input signal. The
  LT6552 is optimized for low supply voltages, ranging
  from 3V to 12V between the rails. In single supply
  operation at 3.3V, the input range includes ground and
  an output that can swing within 400mV of either supply
  rail when driving a 150О© load. Additionally, a shutdown
  feature is provided to allow easy power management
  in supply current-sensitive applications. Dual Input Pair Zaps Common Mode Noise Pickup
  The basic application of the LT6552 is that of a high
  CMRR difference amplifier as shown in Figure 1. Only
  two resistors are required to set the difference gain
  (Gain = 2 in this example). For unity gain, no additional …

Artículos

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  Video Instrumentation Amplifier Easily Extracts Clean Video Signals from Noisy Environments &mdash LT Journal
  PDF, 2.7 Mb, Archivo publicado: marzo 25, 2005
  Extracto del documento

  LINEAR TECHNOLOGY AUGUST 2004 IN THIS ISSUE…
  COVER ARTICLE
  Video Instrumentation Amplifier
  Easily Extracts Clean Video Signals
  from Noisy Environments. 1
  Raj Ramchandani and Jon Munson Issue Highlights . 2
  LTC in the News… . 2
  DESIGN FEATURES
  1.1A Boost Provides
  Soft-Start Capability
  in Tiny ThinSOTв„ў Package . 5
  Brian Adolf Versatile 80V Hot Swap Controllers
  Drive Large MOSFETs; Improve
  Accuracy and Foldback
  Current Limiting. 7
  Mark Belch Triple-Output Regulator Reduces
  EMI; Provides Two Step-Down and
  One Step-Up or Inverting Output . 9
  John Tilly Synchronous Switching
  Regulator Controller
  Allows Inputs up to 100V. 13
  Greg Dittmer 2-Phase Dual Synchronous
  DC/DC Controller with Tracking …

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  Twisted-Pair Transmission of Closed-Circuit Video Made Easy &mdash LT Journal
  PDF, 239 Kb, Archivo publicado: feb 1, 2004
  Extracto del documento

  DESIGN IDEAS Twisted-Pair Transmission of Closedby Jon Munson
  Circuit Video Made Easy
  Introduction With the pervasive adoption of twisted
  pair infrastructure for in-building
  communications, developers of closedcircuit television (CCTV) systems face
  increasing pressure to utilize this
  popular medium. Twisted-pair cabling (Category V, commonly known
  as CAT5, being the prevalent example)
  offers the end user many more signals
  per cable pulled and reduced termination costs compared to traditional
  coaxial-cable (coax) solutions.
  The technical drawback to twistedpair transmission, especially with
  commonly used unshielded-twisted-pair (UTP), is the tendency for
  common-mode noise pickup to degrade the video quality at the receive
  end amplifier. This receiver issue is
  effectively eliminated by using the
  LT6552 differential-input amplifier,
  due to the very high common-mode
  rejection-ratio (CMRR) of the part at
  high frequencies. The LT6552 also
  provides cable-driving output capability, thereby simplifying both the
  conversion of camera coax signals
  into twisted-pair transmissions and …

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Clasificación del fabricante

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Voltage Amplifiers (>12V) | High Speed Amplifiers (GBW > 50MHz) | Rail-to-Rail Amplifiers
• Signal Conditioning > Amplifiers > Video Functions