Ken Kundert
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If you are using Spectre, you can use the scale parameter on the PWL source to adjust the waveform amplitude. If you instead want to use Verilog-A, there are a lot of different ways of doing it, and the best way will depend strongly on the details of the waveform. I'm afraid I'm not going to be able to help you with that other than suggest you learn the language by picking up a copy of my book or by studying the examples on verilog-ams.com, or both. It is definitely worthwhile taking the time to learn it.
-Ken
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