Hi, Pseundo Random Bit Stream by Cadence Virtuoso

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nnmate

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Hello all,

the topic is as mentioned in title, how can i generate a PRBS sequence in Cadence virtuoso (or Spectre?)

I m first using Cadence,
By Hspice it is rather easy with writing script such as V1 PRBS 0 1 ,,,balabala

Is there a similar script log for me to input these signals?

thanks!

Here i have a paper using PRGS in cadence with smic 0.18um process.

Fig 5 shows what i want.

https://www.academypublisher.com/proc/iwisa09/papers/iwisa09p425.pdf


Thanks
 

use rand_bit_stream from ahdlLib
 
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    sz1134

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Thank you so much!

I have a problem which is, the random bit rate should be differential.

how can i create differential PRBS.

Is there a inverter with no delay and convertng the Generators output (low 1V High 1.5V) to (Low 1.5V High 1V)?

Thanks.

ps i cant use 2x Generator, because they are randomed seperatedly, or?

Thanks
 

there is not_gate in ahdlLib as well.
 

Just use two sources with the same settings and flip the high and low voltages on them. This should accomplish what you are looking for.
 

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