Hi all, Sorry for the tag @Stefan Schippers but I am making a capacitive DAC for my SAR ADC project. I am using the following figure as a basis, it's working fine with annotate but I want to get the 256 values faster using external viewer using square waves. With the external viewer though I am only getting 0V for my Vout and I can't seem to fix it. Is it related to this simulation warning "Warning: singular matrix: check node Vout"?

just a guess: you may want to put some dc loading resistor (can be a huge value) on the output, it currently doesn't have a well-defined dc level

@Isabelle Rose Sta Rita To run the above testbench I guess

switch.sch

is also needed...

@Stefan Schippers my bad here it is