Lab 5 - ECE 421L
Draft layouts, schematic, and symbol for two inverters having size of:
Devices | 12u/6u (=width and length of PMOS and NMOS). | 48u/24u (=width and length of PMOS and NMOS). |
Schematic | ||
Layout-no error | ||
Symbol |
12u/6u Inverter schematic conneted to Vdd | 48u/24u Inverter schematic conneted to Vdd |
Inverters | 12u/6u -using spectre | 48u/24u -using spectre |
100fF | ||
1pF | ||
10pF | ||
100pF |
When the capactior is small the response time for both is the same. However, the capactior is higher the respond time for 48u/24u is much more acurate and preceise than 12u/6u. We can see from the graph at 100pF of the 48u/24u has some inversion, but the 12u/6u does not invert and its output will become a constant number.
Set up UltraSim following: Setup->Simulator/Directory/Host and select UltraSim as seen below
Inverters | 12u/6u -using UltraSim | 48u/24u -using UlstraSim |
100fF | ||
1pF | ||
10pF | ||
100pF |