1. Transistors
1) Logic gates built from transistors
2) 3-ported voltage-controlled switch
-2 ports connected depending on voltage of 3rd
-d and s are connected (ON) when g is 1
*Robert Noyce, 1927-1990
-Nicknamed "Mayor of Silicon Valley"
-Confounded Fairchild Semiconductor in 1957
-Cofounded Intel in 1968
-Co-invented the integrated circuit
2. Silicon
1) Transistors built from silicon, a semiconductor
2) Pure cilicon is a poor conductor (no free charges)
3) Doped silicon is a good conductor (free charges)
-n-type (free negative charges, electrons)
-p-type (free positive charges, holes)
3. MOS Transistors
Metal oxide silicon (MOS) transistors:
-Polysilicon (used to be metal) gate
-Oxide (silicon dioxide) insulator
-Doped silicon
4. Transistors: nMOS
Gate=0
OFF(no connection between source and drain)
Gate=1
ON(channel between source and drain)
5. Transistors: pMOS
pMOS transistor is opposite
-ON when Gate =0
-OFF when Gate =1
6. Transistor Function
-nMOS: pass good 0's, so connect source to GND
-PMOS: pass good 1's, so connect sourve to VDD
7. CMOS Gates: NOT Gate
8. CMOS Gates: NAND Gate
📒Exercise
