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The most common filter found in a data acquisition
system signal path is a low-pass filter. This type of filter
is usually used to reduce A/D Converter (ADC) aliasing
errors. If there is more than one signal that is applied to
the A/D converter through a multiplexer, each signal
source may have its own set of filter requirements (i.e.,
settling time, fast transition region, etc.). Consequently,
a variety of filters may be required in the circuit prior to
the multiplexer. Usually these filters are implemented
with operational amplifiers (op amps) in combination
with fixed resistors and capacitors.
M AN737
Using Digital Potentiometers to Design
Low-Pass Adjustable Filters
ble corner frequency range of 1:100. An example of the
Author: Bonnie C. Baker
digital potentiometer setting for these designs is
Microchip Technology Inc.
summarized in Tables 1, 2 and 3. The fourth scenario
will show the same circuit design, where all three
INTRODUCTION

关键词： 数字电位器   可调滤波器   低通滤波器