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Notas de aplicación

• Descargar
  Video Circuit Collection &mdash AN57
  PDF, 559 Kb, Archivo publicado: enero 2, 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.
  Extracto del documento

  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 …

Notas de Diseño

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  C-Load TM Op Amps Conquer Instabilities &mdash DN107
  PDF, 495 Kb, Archivo publicado: jul 1, 1995
  Extracto del documento

  C-Load Op Amps Conquer Instabilities – Design Note 107
  Kevin R. Hoskins
  Introduction
  Linear Technology Corporation has taken advantage of
  advances in process technology and circuit innovations
  to create a series of C-Loadв„ў operational amplifiers that
  are tolerant of capacitive loading, including the ultimate,
  amplifiers that remain stable driving any capacitive load.
  This series of amplifiers has a bandwidth that ranges from
  160kHz to 140MHz. These amplifiers are appropriate for
  a wide range of applications from coaxial cable drivers to
  analog-to-digital converter (ADC) input buffer/amplifiers.
  Driving ADCs
  Most contemporary ADCs incorporate a sample-and-hold
  (S/H). A typical S/H circuit is shown in Figure 1. The hold
  capacitor’s (C1) size varies with the ADC’s resolution but
  is generally in the range of 5pF to 20pF, 10pF to 30pF and
  10pF to 50pF for 8-, 10-and 12-bit ADCs, respectively. gracefully and accurately drive capacitive loads, such as
  Linear Technology’s C-Load line of monolithic amplifiers.
  Table 1 lists Linear Technology’s unconditionally stable
  voltage feedback C-Load amplifiers. Table 2 lists other
  voltage feedback C-Load amplifiers that are stable with
  loads up to 10,000pF. …

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  C-Load TM Op Amps Tame Instabilities &mdash DN83
  PDF, 929 Kb, Archivo publicado: jun 1, 1994
  Extracto del documento

  C-Load Op Amps Tame Instabilities – Design Note 83
  Richard Markell, George Feliz and William Jett
  Introduction
  By taking advantage of advances in process technology
  and innovative circuit design, Linear Technology Corporation has developed a series of C-Loadв„ў op amps which
  are tolerant of capacitive loading, including the ultimate,
  amplifiers which are stable with any capacitive load. These
  amplifiers span a range of bandwidths from 1MHz to
  140MHz. They are suited for a wide range of applications
  from coaxial cable drivers to capacitive transducer exciters.
  The Problem
  The cause of the capacitive load stability problem in most
  amplifiers is the pole formed by the load capacitance and
  the open-loop output impedance of the amplifier. This
  output pole increases the phase lag around the loop which
  reduces the phase margin of the amplifier. If the phase
  lag is great enough the amplifier will oscillate.
  External networks can be used to improve the amplifier’s
  stability with a capacitive load but have serious drawbacks.
  For instance, most designers are familiar with the use of
  a series resistor RS between the load and the amplifier
  output. The optimum value of RS depends on the load
  capacitance, so this approach isn’t useful for ill-defined …

• Descargar
  Source Resistance Induced Distortion in Op Amps &mdash DN84
  PDF, 355 Kb, Archivo publicado: jul 1, 1994
  Extracto del documento

  Source Resistance Induced Distortion in Op Amps
  Design Note 84
  William H. Gross RS
  VIN
  20VP-P +
  DUT –
  –15V VOUT DISTORTION
  ANALYZER DN84 F01 Figure 1 Results
  Unfortunately there is no easy way to predict which amplifiers will have the lowest source resistance induced
  distortion from the data sheets. There are two main
  causes of the distortion: nonlinear input resistance and
  nonlinear input capacitance. At first thought, one would
  not expect the small input capacitance of an op amp to
  cause distortion at a few kHz. But a 10k source is loaded 07/94/84_conv TOTAL HARMONIC DISTROTION (%) 10
  OP27 0.01 12 LF356 14
  0.001 0.0001
  100 16 LT1169
  LT1355 LT1124
  10k
  1k
  SOURCE RESISTANCE (О©) 18 100k
  DN84 F02 Figure 2. 1kHz Distortion vs Source Resistance
  1 …

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• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Low Power Amplifiers (Is < 1mA/amp) | High Voltage Amplifiers (>12V) | Low Noise Amplifiers (