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Экологический статус

Design Notes

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  24-Bit ADC Measures from DC to Daylight &mdash DN219
  PDF, 76 Кб, Файл опубликован: 1 дек 1999
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  24-Bit ADC Measures from DC to Daylight – Design Note 219
  Derek Redmayne
  The need to measure a wide variety of physical phenomena is increasingly important in intelligent sensors. The
  following circuit gives eight examples of the flexibility of
  the LTC В®2408 for sensing real world phenomena. The
  eight inputs of the LTC2408 are used here in a variety
  of ways that would not be practical without the dynamic
  range of the LTC2408.
  GUARD RING 5V ELECTROMETER
  INPUT
  (pH, PIEZO) 3 7 + 2 R5
  5k, 1% 6 LT1793 All of the examples shown use single-ended sensing
  and an absolute minimum of external circuitry. Inputs
  to the circuit shown range from high voltage DC to
  ultraviolet light. Output data represents amplitude or
  power levels for signals in all the AC inputs.
  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.
  DC
  VOLTMETER
  INPUT
  1mV TO 1000V R1 …

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  LT1806: 325MHz Low Noise Rail-to-Rail SOT-23 Op Amp Saves Board Space &mdash DN254
  PDF, 76 Кб, Файл опубликован: 1 апр 2001
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  325MHz Low Noise Rail-to-Rail SOT-23 Op Amp
  Saves Board Space – Design Note 254
  Glen Brisebois
  The new tiny LTВ®1806 combines 325MHz gain bandwidth, 3.5nV/в€љHz voltage noise, 100ОјV input offset
  voltage and rail-to-rail inputs and outputs in a SOT-23
  package. The device is fully specified on 3V, 5V and
  В±5V supplies with a guaranteed maximum input offset
  voltage of 850ОјV at either rail over temperature. It is
  available in commercial and industrial temperature
  grades.
  1MΩ Transimpedance Amplifier Achieves Near
  Theoretical Noise Performance with Large-Area
  Photodiodes
  The circuit of Figure 1 shows the LT1806 in an ultralow
  noise transimpedance amplifier applied to a large-area
  high capacitance photodiode. The LT1806 is used for its
  high gain bandwidth and low noise. The IFN147 ultralow
  noise JFET1 operates at its IDSS (VGS = 0V) with a typical
  transconductance of 40mS. With its source grounded,
  the JFET and its drain resistor, R52, set a voltage gain
  of about 8. The combination of the ultralow noise JFET
  gain stage and the LT1806 low noise amplifier achieves
  the ultralow input noise performance. The circuit’s input …

Статьи

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  1MW Transimpedance Amplifier Achieves Near-Theoretical Noise Performance, 2.4GHz Gain Bandwidth, with Large-Area Photodiodes &mdash LT Journal
  PDF, 153 Кб, Файл опубликован: 1 май 2001
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  DESIGN IDEAS 1MΩ Transimpedance Amplifier
  Achieves Near-Theoretical Noise
  Performance, 2.4GHz Gain Bandwidth,
  with Large-Area Photodiodes by Glen Brisebois
  transimpedance circuit’s noise gain,
  which applies to voltage noise but not
  to current noise or resistor noise,
  rises drastically with frequency (noise
  gain = 1+ ZF/XC). As a sample calculation, a 500pF photodiode has an
  impedance of 3.2k at 100kHz, giving
  a 1MΩ transimpedance circuit a noise
  gain of 314 at that frequency. The
  theoretical noise floor of the 1M
  resistor is 130nV/в€љHz (at room temperature), so any input voltage noise
  above 0.41nV/в€љHz (130nV/в€љHz/314)
  will overtake the resistor noise at
  100kHz. Discrete JFETs are available
  with ultralow voltage noise but they
  have high input capacitance (75pF
  max for the IFN147). Serendipitously,
  the input capacitance of the JFET is
  relatively insignificant compared to
  the 500pF of the example large-area …

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  Four New Amplifiers Serve Many Applications &mdash LT Journal
  PDF, 100 Кб, Файл опубликован: 1 сен 1999
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  LINEAR TECHNOLOGY
  SEPTEMBER 1999 IN THIS ISSUE…
  Four New Amplifiers
  Serve Many Applications . 1
  Issue Highlights . 2
  LTC® in the News… . 2
  DESIGN FEATURES
  JFET Op Amps Equal Low Noise
  Bipolars and Have Picoamp
  Current Noise . 3
  Alexander Strong LTВ®1813: 100MHz, 750V/Вµ s Amplifier
  Draws Only 3mA . 5
  George Feliz Micropower, Precision Current Sense
  Amplifier Operates from 2.5V to 60V
  . 7
  Richard Markell, Glen Brisebois and
  Jim Mahoney Triple 300MHz Current Feedback
  Amplifiers Drive RGB/Component
  Video and LCD Displays . 12
  Brian Hamilton LTC1702/LTC1703 Switching
  Regulator Controllers Set a New
  Standard for Transient Response
  . 16 …

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  JFET Op Amps Equal Low Noise Bipolars and Have Picoamp Current Noise &mdash LT Journal
  PDF, 160 Кб, Файл опубликован: 1 сен 1999
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  DESIGN FEATURES JFET Op Amps Equal Low Noise
  Bipolars and Have Picoamp
  by Alexander Strong
  Current Noise
  The LT1792 and LT1793 are single
  JFET op amps that offer both very low
  voltage noise (4nV/в€љHz for the LT1792
  and 6nV/в€љHz for the LT1793) and low
  current noise (10fA/в€љHz for the
  LT1792 and 0.8fA/в€љHz for the
  LT1793), providing the lowest total
  noise over a wide range of transducer
  impedance. Traditionally, op amp
  users have been faced with a choice:
  which op amp will have the lowest
  noise for the transducer at hand. For
  high transducer impedance, the
  LT1792/LT1793 JFET op amps will
  win over the lowest voltage noise
  bipolar op amps due to lower current
  noise. The current noise (2qIB) of an
  amplifier is a function of the input
  bias current (IB). For lower transducer impedance, bipolar op amps …

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Классификация производителя

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Low Bias Current Amplifiers (Ib < 100pA) | JFET Input Amplifiers | High Voltage Amplifiers (>12V)