Testing of metal gate PMOS digital integrated circuits

Many universities use the metal gate PMOS process for educational laboratory projects in the fabrication of integrated circuits. A semiconductor parameter analyzer is often used for testing the transistors, resistors and inverters on their test chips. The semiconductor parameter analyzer cannot be used for testing a digital circuit with a large number of inputs and outputs. A low cost digital circuit tester has been created using a personal computer and additional boards for output and input. Lab View software was used to create a graphical interface with the test system. The test system has been used to functionally test multiplexers, demultiplexers, full-adders and other digital integrated circuits. The test system generates a plot of input and output voltages versus time very similar to a digital circuit simulator output.