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Application Notes

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  High Speed Amplifier Techniques &mdash AN47
  PDF, 5.3 Мб, Файл опубликован: 1 авг 1991
  This application note, subtitled "A Designer's Companion for Wideband Circuitry," is intended as a reference source for designing with fast amplifiers. Approximately 150 pages and 300 figures cover frequently encountered problems and their possible causes. Circuits include a wide range of amplifiers, filters, oscillators, data converters and signal conditioners. Eleven appended sections discuss related topics including oscilloscopes, probe selection, measurement and equipment considerations, and breadboarding techniques.
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  Application Note 47
  August 1991
  High Speed Amplifier Techniques
  A Designer’s Companion for Wideband Circuitry
  Jim Williams PREFACE
  This publication represents the largest LTC commitment
  to an application note to date. No other application note
  absorbed as much effort, took so long or cost so much.
  This level of activity is justified by our belief that high speed
  monolithic amplifiers greatly interest users.
  Historically, monolithic amplifiers have represented packets of inexpensive, precise and controllable gain. They
  have partially freed engineers from the constraints and
  frustrations of device level design. Monolithic operational
  amplifiers have been the key to practical implementation
  of high level analog functions. As good as they are, one
  missing element in these devices has been speed.
  Devices presently coming to market are addressing monolithic amplifiers’ lack of speed. They bring with them the
  ease of use and inherent flexibility of op amps. When Philbrick Researches introduced the first mass produced
  op amp in the 1950’s (K2-W) they knew it would be used.
  What they couldn’t possibly know was just how widely,
  and how many different types of applications there were.
  As good a deal as the K2-W was (I paid $24.00 for mine or rather, my father did), monolithic devices are far better.
  The combination of ease of use, economy, precision and …

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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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  High Frequency Amplifier Evaluation Board &mdash DN50
  PDF, 121 Кб, Файл опубликован: 1 янв 1991
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  High Frequency Amplifier Evaluation Board – Design Note 50
  Mitchell Lee
  Introduction
  Demo board DC009 is designed to simplify the evaluation
  of high speed operational amplifiers. It includes both an
  inverting and non-inverting circuit, and pads are provided
  to allow the use of board-mounted BNC or SMA connectors.
  The two circuits are independent, with the exception of
  shared power supply and ground connections. High Speed Layout Techniques grounds are still separated. For example, the termination
  resistors (R3 and R7) and the gain-setting resistor (R1)
  are grounded in the vicinity of the input connector. Supply
  bypass capacitors (C1, C2, C4, C5, C7, C8, C9, and C10)
  are returned to ground in the vicinity of the output
  connectors. Optional Components Layout is a primary contributor to the performance of any
  high speed amplifier. Poor layout techniques adversely
  affect the behavior of a finished circuit. Several important
  layout techniques, all used in demo board DC009, are
  described below: The circuit board is designed to accommodate standard 8pin miniDIP, single operational amplifiers, such as the
  LT1190 and LT1220 families. Both voltage and current
  feedback types can be used. Pins 1, 5, and 8 are outfitted
  with pads for use in adjusting DC offsets, compensation
  or, in the case of the LT1223 and LT1190/1/2, for shutting
  down the amplifier. Top Side Ground Plane: The primary task of a ground …

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  Video Circuits Collection &mdash DN57
  PDF, 79 Кб, Файл опубликован: 1 апр 1992
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  Video Circuits Collection – Design Note 57
  William H. Gross
  Introduction
  This note shows how to make several different video
  circuits using high speed op amps. All of these circuits
  work with composite, RGB and monochrome video.
  For best results, bypass the power supply pins of
  these amplifiers with 1μF to 10μF tantalum capacitors
  in parallel with 0.01ОјF disc capacitors. It is important
  to terminate both ends of video cables to preserve
  frequency response. When properly terminated, the
  cable looks like a resistive load of 150О©.
  Lots of Inputs Video MUX Cable Driver (LT1227) Multiplex Amplifiers
  Often it is desirable to select one of several signals to
  send down a cable. Connecting the outputs of several
  amplifiers together and using the amplifier’s shutdown
  pin to disable all but one accomplishes this goal. The
  LTВ®1190, LT1191, LT1192, and LT1193 are shutdown by
  pulling pin 5 to the negative supply.
  The LT1223 and LT1227 current feedback amplifiers are
  shutdown by pulling Pin 8 to ground. During normal
  operation Pin 8 is open and at the positive supply potential. An easy way to interface Pin 8 to logic is with
  a logic level N-channel FET or a 74C906 (open-drain …

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