Quantizing sine wave

Hi , 

I want my input sine wave to be quantized , example my input sine wave is of 1khz frequency and has a amplitude of 800nA. I want it to be quantized such that it has a step of 100nA. How can I do this in cadence Virtuoso.

I am using spectre simulator and my cadence virtuoso version is ICADVM 20.1-64b.500.18.

Best regards,

Farhan