How to setup and measure DNL and INL in Cadence Spectre?

[coolstuff07]

Hi,

What is the setup for INL and DNL and hoew to measure
INL and DNL in cadence spectre.

Bye.

 

[erikl]

inl dnl calculation

Use a linear or stair case ramp of about 1bit/sample, and compare the converter's output to its input (reconvert the output by an ideal anti-converter, if necessary). You must take care of the time latency, apparently, (either in time or in voltage/bit domain).
For INL/DNL calculation, use their standard definitions, respectively.

 

[lladnar23]

dnl inl

I thought I saw some verilog-a code on Poulton's site to automagically calculate INL/DNL...

 

[engronger]

inl dnl calculations

could you please share it ?
thanks very much

I thought I saw some verilog-a code on Poulton's site to automagically calculate INL/DNL...

 

[iamxo]

inl calculation

Use a linear or stair case ramp of about 1bit/sample, and compare the converter's output to its input (reconvert the output by an ideal anti-converter, if necessary). You must take care of the time latency, apparently, (either in time or in voltage/bit domain).
For INL/DNL calculation, use their standard definitions, respectively.

Hi, the histogram testing is also popular, in which the sinusoidal wave input is added. what do you think?

 

[erikl]

inl dnl pdf

Hi, the histogram testing is also popular, in which the sinusoidal wave input is added. what do you think?

Sure, this is also a very valuable method, however needs more effort in simulation and data processing. S. e.g. p.3 (Fig. 8 ) of the PDF below. Fig. 10 on p. 4 shows the standard DNL / INL presentations.