Integrated Circuits and Systems group, IIT Madras

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
  • You can use a separate power supply for generating the variable bias voltages or a resistive voltage divider(say, a chain of 16 identical resistors from Vcc to ground)
  • Use a 5V supply for CD 4069
  • Be sure to disable the unused transistors by connecting their inputs appropriately as shown in the figures