Is there a way to create

Question

< Stefan Schippers> < Tim Edwards> Is there a way to create a voltage source such as PWL which can read from CSV files Then using this voltage source to drive analog or digital circuit Any suggestion please

Tim Edwards · Answer

I also use the xspice `d source` component which reads values from a file to apply for digital input This is probably the most efficient way to apply digital vectors The third choice is to use the iverilog cosimulation but that requires a special compilation of ngspice that is currently buried in an obscure development branch

Tim Edwards · Answer

< Ahmed Reda> This is a snippet of the code I used for a transient simulation of the DAC ``` Method to simulate transient output on a DAC Use d source pull data from a pre made file representing digital data for 4 cycles of a rail to rail sine wave ASINE Db7 Db6 Db5 Db4 Db3 Db2 Db1 Db0 sinegen model sinegen d source input file= testbench sine1x4 dat ACONV7 Db7 Db6 Db5 Db4 Db3 Db2 Db1 Db0 b7 b6 b5 b4 b3 b2 b1 b0 dtoa model dtoa dac bridge out high=1 8 out low=0 t rise=5 0e 10 t fall=5 0e 10 ``` Contents of the first few lines of `sine1x4 dat` ``` Octave data file for xspice model d source created by CACE Format is time value followed by digital state 0 1s 0s 0s 0s 0s 0s 0s 0s 9 76562e 10 1s 0s 0s 0s 0s 0s 0s 0s 1 95312e 09 1s 0s 0s 0s 0s 0s 0s 1s 2 92969e 09 1s 0s 0s 0s 0s 0s 1s 0s ``` It says octave at the top because I used an octave script to generate the data could have been done with numpy as well

Ahmed Reda · Answer

< Tim Edwards> Thanks