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MAX3225EEAP+T 其他数据使用手册 - Maxim Integrated（美信）
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Maxim > Design Support > Technical Documents > Tutorials > Amplifier and Comparator Circuits > APP 4993
Maxim > Design Support > Technical Documents > Tutorials > Analog Switches and Multiplexers > APP 4993
Maxim > Design Support > Technical Documents > Tutorials > General Engineering Topics > APP 4993
Keywords: digital potentiometer, low pass filter, filter, low-pass filter, lowpass filte, anti aliasing, sampled
data system, folded, Nyquist, data converters, spectrum, harmonics, FFT, ADC, convolution, DAC, op
amps, RC, LC, Butterworth
TUTORIAL 4993
Reduce the Chances of Human Error: Part 2,
Super Amps and Filters for Analog Interface
By: Bill Laumeister, Strategic Applications Engineer
Mar 08, 2011
Abstract: A common view holds that digital circuits just work naturally, but analog circuits are hard to
implement. There is truth to that old belief—analog interface is an expert subject that requires training. It
is, moreover, always better to avoid an issue than to try to solve it later. This is precisely why we should
take advantage of some basic concepts that experienced analog engineers perform as a reflex. This
application note provides some basic reminders and concepts about amplifiers and filters for you to
consider during a design.
Introduction
As children we learned to share and in that process we learned about portions. Many parents taught this
to children by having one child cut the pie or cake and then letting another child pick the piece first. We
can be sure that great care was used to make the pieces all the same size.
We are reminded of a good lesson in life, "It's the ratio that counts." We use ratios in everyday life when
we compare distances between different routes or the taste of two foods. (Yes, mom's cooking was
better, or maybe we were too young to know any difference?).
Moving from children, pies, and cakes to analog engineering design, we realize that ratios—the relative
amount, proportion, percentage, share, part, and fraction—are all important measurements in analog
design. When we ignore these ratios and relationships, we introduce human error into what must be a
precise process. This application note shares some analog concepts about amplifiers and filters that will
help reduce the chances of "human" error and improve the analog design.
Considerations for Signal to Noise (SNR)
Crosstalk and signal to noise (SNR) are expressed as ratios, a proportion of good to bad. How does one
improve the SNR of a signal? If a particular circuit contributes considerable noise, we have two basic
options: first, reduce the noise somehow, or second, increase the amplitude of the good signal before it
goes through the stage. Figure 1 illustrates the concept.
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