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Notas de Diseño

• Descargar
  Matched Resistor Networks for Precision Amplifier Applications &mdash DN502
  PDF, 87 Kb, Archivo publicado: marzo 22, 2012
  Extracto del documento

  Matched Resistor Networks for Precision Amplifier Applications
  Design Note 502
  Tyler Hutchison
  Introduction
  Some ideal op amp configurations assume that the
  feedback resistors exhibit perfect matching. In practice,
  resistor non-idealities can affect various circuit parameters such as common mode rejection ratio (CMRR),
  harmonic distortion and stability. For instance, as
  shown in Figure 1, a single-ended amplifier configured
  to level-shift a ground-referenced signal to a common
  mode of 2.5V needs a good CMRR. Assuming 34dB
  CMRR and no input signal, this 2.5V level shifter exhibits
  an output offset of 50mV, which can even overwhelm
  the LSB and offset errors of 12-bit ADCs and drivers.
  R
  VCC
  R +
  – VIN +
  – R
  2.5V
  R
  DC – + LTC6255 + DN502 F01 –
  VEE Figure 1. A Single-Ended Op Amp Used as a Level Shifter For an op amp, 34dB is a less than ideal CMRR. However, …

Artículos

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  Precision Fully Differential Op Amp Drives High Resolution ADCs at Low Power &mdash LT Journal
  PDF, 375 Kb, Archivo publicado: enero 6, 2014
  Extracto del documento

  Precision Fully Differential Op Amp Drives High Resolution
  ADCs at Low Power
  Kris Lokere The LTC6362 op amp produces differential outputs, making it ideal for processing
  fully differential analog signals or taking a single-ended signal and converting it
  to fully differential. Many alternative op amps of this fully differential nature are
  optimized for very high speed operation, resulting in high power consumption and
  lack DC accuracy. The LTC6362 is unique in that it features differential outputs,
  low power consumption and accurate DC offset voltage (see Table 1).
  HOW DOES IT WORK? Let’s take a closer look at how a differential op amp works. Just like a regular
  op amp, it has two inputs, but unlike a
  regular op amp, it also has two outputs,
  labeled –OUT and +OUT. A regular op amp
  features high open-loop gain between the
  differential input and the one output; a
  fully differential op amp features high
  open-loop gain between the differential input and the differential output.
  Feedback should also be applied differentially. Figure 1 shows four external resistors feeding a portion of the
  differential output back into the differential input. Just like in a regular RI VCM +
  – VINP +
  – VINM –
  + V+IN RF V–OUT +
  VOCM пЈ«R пЈ¶
  ≈ пЈ¬ F пЈ ( VINP – VINM ) …

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Clasificación del fabricante

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > Low Power Amplifiers (Is < 1mA/amp) | Low Noise Amplifiers ( | Rail-to-Rail Amplifiers | Precision Amplifiers (Vos | High Speed Amplifiers (GBW > 50MHz)
• Signal Conditioning > Amplifiers > Differential Amplifiers > Fully Differential Amplifiers | Single-Ended To Differential Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers

Otros nombres:

LTC6362CDDPBF, LTC6362CDD PBF