had I several people come and ask me the following question regarding
LAB3:
Where should the substrate or body of the nMOS and pMOS transistors
be connected?
Answer:
In many applications the substrate (or body) terminal is connected
to the source terminal, which results in the pn junction between
the substrate and the induced channel having a constant zero bias.
In such a case the substrate does not play any role in circuit
operation and its existence can be ignored altogether.
In integrated circuits, however, the substrate is usually common
to many MOS transistors. In order to maintain the cut-off condition
for all the substrate-to-channel junctions, the substrate connected is
usually to the most negative power supply in an NMOS circuit
(the most positive in a PMOS circuit)
So to summarize:
(1) For nMOS connect substrate to most negative terminal.
i.e for LAB3 connect substrate to GND.
(2) for pMOS connect substrate to most positive terminal.
i.e for LAB3 connect substrate to 3.3 Volts or 5 volts (what
ever your VDD is)
NOTICE: In LAB3 han...