====== Transistor and inverter characteristics ======
* Determine the current factor and the threshold voltage of nMOS and pMOS transistors in CD4069 by fixing VDS to Vcc/2 and varying VGS
* Determine the IDS versus VDS for VGS=Vcc/2
* Determine Iout versus Vin of the inverter with Vout=Vcc/2
* Use a chain of 16 identical resistors from Vcc to ground to generate variable bias voltages
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