layout of simple circuits using l-edit
For this lab, we used L-edit, a simple program that helps us lay out silicon and metal layers, to draw basic transistors. We first laid out an NMOS transistor and then a PMOS transistor. Then combining these (CMOS) we constructed an inverter gate, a nand gate and a nor gate. We then extracted out layout and simulated our gates in SPICE®. Finally, we created a 4-input nand gate in two ways; first using CMOS to build one from ground up, and second by combining the NAND, NOR and the inverter gates.