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Application Notes

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  Video Circuit Collection &mdash AN57
  PDF, 559 Кб, Файл опубликован: 2 янв 1994
  AN57, the Video Circuit Collection, features a variety of video circuits designed at LTC. The LT1204 70MHz multiplexer is featured in a number of circuits which require excellent video isolation from channel to channel. High speed voltage and current feedback amplifiers are highlighted throughout the section on video processing circuits. There is a section on applying Current Feedback Amplifiers (CFAs) and a number of articles taken from the Linear Technology magazine.
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  Application Note 57
  January 1994
  Video Circuit Collection
  Jon Munson and Frank Cox
  INTRODUCTION
  Even in a time of rapidly advancing digital image processing, analog video signal processing still remains eminently
  viable. The video A/D converters need a supply of properly
  amplified, limited, DC restored, clamped, clipped, contoured, multiplexed, faded and filtered analog video before
  they can accomplish anything. After the digital magic is
  performed, there is usually more amplifying and п¬Ѓltering
  to do as an adjunct to the D/A conversion process, not to mention all those pesky cables to drive. The analog way
  is often the most expedient and efficient, and you don’t
  have to write all that code.
  The foregoing is only partly in jest. The experienced engineer
  will use whatever method will properly get the job done;
  analog, digital or magic (more realistically, a combination
  of all three). Presented here is a collection of analog video
  circuits that have proven themselves useful. CIRCUIT INDEX
  I. Video Amplifier Selection Guide . 2 II. Video Cable Drivers . 3
  AC-Coupled Video Drivers . 3
  DC-Coupled Video Drivers . 4
  Clamped AC-Input Video Cable Driver . 5
  Twisted-Pair Video Driver and Receiver . 5 III. Video Processing Circuits . 6 …

Design Notes

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  Updated Operational Amplifier Selection Guide for Optimum Noise Performance &mdash DN140
  PDF, 74 Кб, Файл опубликован: 1 окт 1996
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  Operational Amplifier Selection Guide for
  Optimum Noise Performance – Design Note 140
  Frank Cox
  Eight years ago, George Erdi wrote a very useful Design
  Note (DN6) that presented information to aid in the
  selection of op amps for optimum noise performance,
  in both graphical and tabular form. Design Note 140 is
  an update of DN6. It covers new low noise op amps as
  well as some high speed op amps. Although a great deal
  has changed in eight years, especially in electronics,
  noise is still a critical issue in op amp circuit design
  and the LTВ®1028 is still the lowest noise op amp for
  low source impedance applications.
  The amount of noise an op amp circuit will produce
  is determined by the device used, the total resistance
  in the circuit, the bandwidth of the measurement, the
  temperature of the circuit and the gain of the circuit. A
  convenient п¬Ѓgure of merit for the noise performance
  of an op amp is the spectral density or spot noise. This
  is obtained by normalizing the measurement to a unit
  of bandwidth. Here the unit is 1Hz and the noise is reported as “nV/√Hz.” The noise in a particular application
  bandwidth can be calculated by multiplying the spot
  noise by the square root of the application bandwidth. …

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  A Broadband Random Noise Generator &mdash DN70
  PDF, 95 Кб, Файл опубликован: 1 май 1993
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  A Broadband Random Noise Generator – Design Note 70
  Jim Williams
  Filter, audio and RF communication testing often requires a random noise source. The circuit in Figure 1
  provides an RMS amplitude regulated noise source with
  selectable bandwidth. The RMS output is 300mV with
  a 1kHz to 5MHz bandwidth selected in decade ranges. output feeds LT1228 A4, a current feedback amplifier.
  A4’s output, the circuit’s output, is sampled by the A5
  based gain control configuration. This closes a gain
  control loop back at A3. A3’s ISET input current controls
  its gain, allowing overall output level control. The A1 amplifier, biased from the LT®1004 reference,
  provides optimum drive for D1, the noise source. AC
  coupled A2 takes a broadband gain of 100. The A2
  output feeds a gain control stage via a simple selectable
  lowpass filter. The filter’s output is applied to LT1228
  A3, an operational transconductance amplifier. A3’s To adjust this circuit, place the filter in the 1kHz position
  and trim the 5k potentiometer for maximum negative
  bias at A3, Pin 5.
  L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  of Linear Technology Corporation. All other trademarks are the property of their
  respective owners. 1M
  0.1ОјF
  15V
  100k 2 3 – 1kHz 8 0.01ОјF …

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