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Application Notes

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  Application and Optimization of a 2GHz Differential Amplifier/ADC Driver &mdash AN123
  PDF, 537 Kb, File published: Dec 8, 2009
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  Application Note 123
  December 2009
  Application and Optimization of a 2GHz Differential
  Amplifier/ADC Driver
  Cheng-Wei Pei and Adam Shou
  TABLE OF CONTENTS
  1 INTRODUCTION . 2
  1.1 LTC6400 Features .2
  1.2 Internal Gain/Feedback Resistors .2
  2 LOW DISTORTION. 3
  2.1 Actual Bandwidth vs Usable Bandwidth .3
  2.2 Low-Frequency Distortion Performance . 4
  2.3 Distortion Performance Guaranteed . 4
  3 LOW NOISE . 5
  3.1 Noise and NF vs Source Resistance.6
  3.2 Noise and Gain Circles . 7
  3.3 Signal-to-Noise Ratio vs Bandwidth .8
  4 GAIN AND POWER OPTIONS . 9
  4.1 Gain, Phase and Group Delay .9
  4.2 Gain of 1 Configuration . 10
  5 INPUT CONSIDERATIONS . 11
  5.1 Input Impedance .11
  5.2 AC Coupling vs DC Coupling. 12 …

Design Notes

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  Signal Chain Noise Analysis for RF-to-Digital Receivers &mdash DN439
  PDF, 85 Kb, File published: Apr 16, 2008
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  Signal Chain Noise Analysis for RF-to-Digital Receivers
  Design Note 439
  Cheng-Wei Pei
  Introduction
  Designers of signal receiver systems often need to perform cascaded chain analysis of system performance
  from the antenna all the way to the ADC. Noise is a critical parameter in the chain analysis because it limits the
  overall sensitivity of the receiver. An application’s noise
  requirement has a significant influence on the system
  topology, since the choice of topology strives to optimize
  the overall signal-to-noise ratio, dynamic range and
  several other parameters. One problem in noise calculations is translating between the various units used by the
  components in the chain: namely the RF, IF/baseband,
  and digital (ADC) sections of the circuit.
  Figure 1 shows a simplified system diagram. There is
  an RF section, an IF/baseband section (represented
  by an amplifier) and an ADC. The RF section, which
  includes a mixer or demodulator, is commonly specified
  using noise п¬Ѓgure (NF) in a decibel scale (dB). This may
  also be specified with a noise power spectral density
  which is similar to NF in concept (e.g., –160dBm/Hz is
  RF SECTION
  NOISE FIGURE (dB) 1 RT
  50О© – …

Model Line

Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Speed Amplifiers (GBW > 50MHz) | Low Noise Amplifiers (
• Signal Conditioning > Amplifiers > Differential Amplifiers > Fully Differential Amplifiers

Other Names:

LTC6400CUD-26PBF, LTC6400CUD-26 PBF, LTC6400CUD26#PBF, LTC6400CUD 26#PBF