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Application Notes

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  High Speed Comparator Techniques &mdash AN13
  PDF, 1.1 Мб, Файл опубликован: 1 апр 1985
  The AN13 is an extensive discussion of the causes and cures of problems in very high speed comparator circuits. A separate applications section presents circuits, including a 0.025% accurate 1Hz to 30MHz V/F converter, a 200ns 0.01% sample-hold and a 10MHz fiber-optic receiver. Five appendices covering related topics complete this note.
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  Application Note 13
  April 1985
  High Speed Comparator Techniques
  Jim Williams
  INTRODUCTION
  Comparators may be the most underrated and underutilized monolithic linear component. This is unfortunate
  because comparators are one of the most flexible and
  universally applicable components available. In large
  measure the lack of recognition is due to the IC op amp,
  whose versatility allows it to dominate the analog design
  world. Comparators are frequently perceived as devices,
  which crudely express analog signals in digital form—a
  1-bit A/D converter. Strictly speaking, this viewpoint is
  correct. It is also wastefully constrictive in its outlook.
  Comparators don’t “just compare” in the same way that
  op amps don’t “just amplify”.
  Comparators, in particular high speed comparators, can
  be used to implement linear circuit functions which are
  as sophisticated as any op amp-based circuit. Judiciously
  combining a fast comparator with op amps is a key to
  achieving high performance results. In general, op ampbased circuits capitalize on their ability to close a feedback
  loop with precision. Ideally, such loops are maintained
  continuously over time. Conversely, comparator circuits …

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  Thermal Techniques in Measurement and Control Circuitry &mdash AN5
  PDF, 175 Кб, Файл опубликован: 1 дек 1984
  6 applications utilizing thermally based circuits are detailed. Included are a 50MHz RMS to DC converter, and anemometer, a liquid flow meter and others. A general discussion of thermodynamic considerations involved in circuitry is also presented.
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  Application Note 5
  December 1984
  Thermal Techniques in Measurement and Control Circuitry
  Jim Williams
  Designers spend much time combating thermal effects in
  circuitry. The close relationship between temperature and
  electronic devices is the source of more design headaches
  than any other consideration. regulator’s output low, biasing Q1. As the heater warms,
  the thermistor ’s value decreases. When its inputs finally
  balance, A1 comes out of saturation and the LT3525A pulse
  width modulates the heater via Q1, completing a feedback
  path. A1 provides gain and the LT3523A furnishes high
  efficiency. The 2kHz pulse width modulated heater power
  is much faster than the thermal loop’s response and the
  oven sees an even, continuous heat flow. In fact, instead of eliminating or compensating for thermal
  parasitics in circuits, it is possible to utilize them. In particular, applying thermal techniques to measurement and
  control circuits allows novel solutions to difficult problems.
  The most obvious example is temperature control. Familiarity with thermal considerations in temperature control
  loops permits less obvious, but very useful, thermallybased circuits to be built. The key to high performance control is matching the gain
  bandwidth of A1 to the thermal feedback path. Theoretically, it is a simple matter to do this using conventional
  servo-feedback techniques. Practically, the long time
  constants and uncertain delays inherent in thermal systems
  present a challenge. The unfortunate relationship between …

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  Applications of New Precision Op Amps &mdash AN6
  PDF, 784 Кб, Файл опубликован: 1 янв 1985
  Application considerations and circuits for the LT1001 and LT1002 single and dual precision amplifiers are illustrated in a number of circuits, including strain gauge signal conditioners, linearized platinum RTD circuits, an ultra precision dead zone circuit for motor servos and other examples.

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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  3V Operation of Linear Technology Op Amps &mdash DN56
  PDF, 78 Кб, Файл опубликован: 1 фев 1992
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  3V Operation of Linear Technology Op Amps -Design Note 56
  George Erdi
  The latest trend in digital electronics is the introduction
  of numerous ICs operating on regulated 3V or 3.3V
  power supplies. This is a logical development to increase
  circuit densities and to reduce power dissipation. In addition, many systems are directly powered by two AA
  cells or 3V lithium batteries. Clearly, analog ICs which
  work on 3V with good dynamic range to complement
  these digital circuits are, and will be, in great demand.
  Many Linear Technology operational amplifiers work
  well on a 3V supply. The purpose of this design note
  is to list these devices and their performance when
  powered by 3V. The op amps can be divided into two
  groups: single and dual supply devices. The single supply
  op amps are optimized for, and fully specified at, a 5V
  positive supply with the negative supply terminal tied
  to ground. Input common mode voltage range goes
  below ground, and the output swings to within a few
  millivolts of ground while sinking current. Members of
  the single supply family are the micropower LTВ®1077/
  LT1078/LT1079 single, dual and quad op amps with
  40μA supply current per amplifier, the LT1178/LT1179 dual and quad with 13μA per amplifier. The LT1006/
  LT1013/LT1014 single, dual and quad have faster speed …

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• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Precision Amplifiers (Vos | Low Noise Amplifiers ( | High Voltage Amplifiers (>12V)