On 01/09/2023 10:40, Brian Padalino wrote:
On Fri, Sep 1, 2023 at 8:58 AM <seckinoncu8...@gmail.com> wrote:
I have an N320 that I am using. Currently UHD 4.4 is installed.
When I send a pulsed signal and choose the pulse amplitude between
0.9 and 1, the beginning and end of the pulses are distorted with
the same pattern.
This is most likely due to the digital filtering happening before
hitting the DAC.
What sample rate are you running your N320 application at? In other
words, what input sample rate are you giving the N320 that it then has
to interpolate up to the master clock rate it runs out to the DAC?
Brian
Could be a number of things. Any time you run a signal processing
system very close to its limits, you can expect distortion
of some sort. This could be:
o Inadequate bit-growth management in the (digital) filter chain
leading up to the DAC
o Distortion in the DAC at high output levels
o Distortion in the analog mixer at high baseband levels
o Distortion further along in the analog signal chain
I suspect Brian is correct, and this is a digital filter artifact. It
can be hard to design filters to deal with bit-growth issues in a way
that preserves maximum dynamic range and then scales as appropriate
for the DAC the filter is feeding--at least from what
I understand. That doesn't mean there isn't a residual scaling or
bit-growth issue in the filters, but I'd say reduce the
baseband magnitude a bit.
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