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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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  C-Load TM Op Amps Conquer Instabilities &mdash DN107
  PDF, 495 Кб, Файл опубликован: 1 июл 1995
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  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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  The LT1166: Power Output Stage Automatic Bias System Control IC &mdash DN126
  PDF, 156 Кб, Файл опубликован: 5 мар 1996
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  advertisement The LT1166: Power Output Stage Automatic Bias System
  Control IC – Design Note 126
  Dale Eagar
  Class AB amplifiers are popular because of their “near
  Class A” performance and their ability to operate on considerably less quiescent power than Class A. Class AB amplifiers are easy to construct, rugged and reliable. However,
  there is an aspect of these amplifiers that can cause
  perplexity, consternation and finally hair loss––their bias
  scheme. The problem is that the very parameter that makes
  Class AB so good, namely, low quiescent current, is poorly
  controlled. The LT В®1166 offers control over the quiescent
  current directly, removing the necessity of temperature
  tracking, matching transistors or trim pots. In addition, it
  removes all excess crossover distortion caused by improperly set quiescent current, and significantly reduces the
  distortion caused by the effects of nonlinear transconductance in the output transistors.
  Functional Description
  The LT1166 (Figure 1), combined with external transistors,
  implements a unity-gain buffer. The circuit controls the
  Class AB output stage by incorporating two control loops,
  the current-control loop and the voltage-control loop. The
  current-control loop (Figure 2) operates independently of
  the voltage loop while keeping the product of V1 and V2
  constant. The voltage loop maintains the output voltage at
  the input voltage level by driving both gates up or down. …

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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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  LTC1560-1: Tiny 1MHz Lowpass Filter Uses No Inductors &mdash DN169
  PDF, 871 Кб, Файл опубликован: 1 дек 1997
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  LTC1560-1: Tiny 1MHz Lowpass Filter Uses No Inductors
  Design Note 169
  Nello Sevastopoulos
  The LTC В®1560-1 is a fully integrated continuous-time filter
  in an SO-8 package. It provides a 5-pole elliptic response
  with a pin selectable cutoff frequency (fC) of 1MHz or
  500kHz. Several features distinguish the LTC1560-1 from
  other commercially available high frequency, continuoustime monolithic filters: response is shown in Figure 2. In the 1MHz mode, the
  passband gain is flat up to (0.55)(fC) with a typical ripple
  of В± 0.2dB, increasing to В±0.3dB for input frequencies up to
  (0.9)(fC). The stopband attenuation is 63dB starting from
  (2.43)(fC) and remains at least 60dB for input frequencies
  up to 10MHz. 5-pole 0.5MHz/1MHz elliptic in an SO-8 package 70dB signal-to-noise ratio (SNR) measured at 0.07% THD 75dB signal-to-noise ratio (SNR) measured at 0.5% THD 60dB or more stopband attenuation No external components required other than supply and ground decoupling capacitors The elliptic transfer function of the LTC1560-1 was chosen as a compromise between selectivity and transient
  response. Figure 3a shows the 2-level eye diagram of the
  filter. The size of the “eye” opening shows that the filter is
  suitable for data communications applications. Additional
  phase equalization can be performed with the help of an
  external dual op amp and a few passive components. This
  is shown in Figure 4, where a 2nd order allpass equalizer
  is cascaded with the IC. The allpass function is achieved
  through traditional techniques, namely, passing a signal
  through a low Q inverting bandpass filter and then performing summation with the appropriate gain factors.
  Figure 3b shows the eye diagram of the equalized filter. The LTC1560-1 delivers accurate fixed cutoff frequencies of 500kHz and 1MHz without the need for internal …

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  C-Load TM Op Amps Tame Instabilities &mdash DN83
  PDF, 929 Кб, Файл опубликован: 1 июн 1994
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  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 …

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