Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

existence of glitches on analog output after conversion of digital output of ADC

Status
Not open for further replies.
R

Rezaa

Junior Member level 2
Joined
Aug 5, 2014
Messages
21
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
200
Hello guys,
I've imported digital output of a pipeline ADC, designed and simulated in hspice to Matlab, then I've converted it to an analog variable.

ouit.jpg

Have anyone experienced such glitches in this case? Any chance to have a clean output analog waveform?
 

Your Matlab simulation is probably faithfully passing the
time-skews of the digital outputs (bit-to-bit, LH to HL)
making there be transient, not-real-code states between
the states. You can filter the output and watch the
glitch energy be "soaked up" by capacitance, you can
register the codes with an ideal register that provides
ideal edge synchrony before the DAC module, etc.
You could resample the DAC analog output away from
input switching edges.

But every real ADC has such edge alignment skews
and every real DAC has glitch energy. A clean analog
waveform rarely exists in real life, less so the closer
you look (and sometimes the act of observing musses
things up, itself).
 
  • Like
Reactions: Rezaa

    R

    Rezaa

    Points: 2
    Helpful Answer Positive Rating
My biggest issue is in taking FFT.. I'm trying to take a FFT for a week but not succeed. Taking FFT of this ADC is critical for me. I used so many ways, codes and toolbox.
About those glitches, they also does exist in my bits. based on my observations it is caaused by "digital error correction circuit" consisting full-adders, due to the delay of Carry produced to next adder.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top