Tag Archives: FFT

The Engineers Guide to using ADCs and DACs issue 80

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xilinx80

Once it’s performed the task it
was designed to do, an FPGAbased
system next has to interface
with the real world, and as every
engineer knows, the real world tends
to function around analog as opposed
to digital signals. That means conversion
is going to be required to and from
the digital domain from the analog
realm. Just as you face a plethora of
choices in selecting the correct FPGA
for the job at hand, so too will you find
an abundance of riches when choosing
the correct ADC or DAC for a system.

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Ins and Outs of Digital Filter Design and Implementation Issue 78

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xilinx78

Filters are a key part of any signal-
processing system, and as
modern applications have
grown more complex, so has
filter design. FPGAs provide
the ability to design and implement filters
with performance characteristics that
would be very difficulty to re-create with
analog methods. What’s more, these digital
filters are immune to certain issues that
plague analog implementations, notably
component drift and tolerances (over temperature,
aging and radiation, for high-reliability
applications). These analog effects
significantly degrade the filter performance,
especially in areas such as passband ripple.

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