We are working on a project using cadence virtuoso 6.1.4 that requires us to add noise to the circuit.Could someone guide us as to how we can add noise to vsource?Also could we get some suggestions about number of noise/frequency point and its parameters in Vsorce analog library.
Thanks in advance!
you can just select analogLib vsource, in the Properties form (select the source in the schematic view and type "q") you will see a CDF parameter called "Noise file name" and the next one is "Number of noise/freq pairs". If you type "2" into this latter field, other fields will appear : Freq1, Noise1, Freq2, Noise2.
If you are exploring possibilities, you can just type there as many points as you like and see your circuits' reaction to that.
Otherwise, you can point the source to a Noise file. This is just a txt file with pairs freq/noise. You can run an AC simulation on another circuit and save the output to a file (as in saving a waveform to a table) and then use this output in other circuits, just by linking it through a vsource. Or through an isource, if the output of your previous simulation was an inoise :)
Hope this helps,
In reply to MicheleA:
Do you know how to add a stochastic noise to vsource?
thank you very much!
In reply to smalldragon:
First of all, please read the forum guidelines (the first post in each forum) which tell you a) not to post on the end of old threads and b) not to post the same question multiple times.
If you want something other than a piecewise noise input, you could use a port instead of vsource. This has a built-in resistor and hence is a white noise generator. Other than that, you can use it like a vsource (except the amplitude can be specified in dBm).