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A/D Board Tutorial
Slideshow Contents
Introduction
Typical A/D Board Architecture
A/D Chip Technology
Resolution and Input Range
Input Bandwidth
Input Channel Configurations
Differential Input Simulation
A/D Sampling Methods
A/D Triggers
Sampling Sequences
Data Transfer to Memory
Interrupt Timing
Source Impedance
Source Impedance - Solution
Calibration
Autocalibration
Comparison Test: Autocalibration vs. Manual Calibration
Results: Autocalibration vs. Manual Calibration
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Source Impedance - Solution


To solve the problem of high source impedance, insert a high-speed op amp between the signal source and the A/D input to reduce the source impedance. This eliminates the voltage divider effect and also minimizes the input bandwidth reduction caused by interaction with the input multiplexor capacitance.

When selecting an op amp, a general rule of thumb is that a slew rate of 2V / uS is required for each 100KHz of bandwidth or sample rate. The higher the slew rate, the higher the speed and the better the performance in high-speed sampling applications.