Patrick Lloyd

01/28/2021, 8:06 PM
So if I'm trying to make a sigma-delta ADC, I need to design an integrator (R's, C's, & op-amp), a comparator, and a DAC (maybe PDM digital circuit with an RC filter?), and some method of adding the feedback to the input. Is there a repository of analog primitives in the PDK or do all these things need to be made from standard cells like MOSFETs? Also, something that appealed to me about the digital side of the open source tools was the possibility to basically go from verilog to lithographic mask files via OpenLane, and the tools would do their best with layout at routing. Is there anything like that at the moment for analog design or is it a pretty manual process?