Lateral PNP Layout '' Correct

1
Lateral PNP Layout .. Correct ??
Pbase(C )
nwell(B)
Pbase(E)
pselect
Note that IF the pselect diffusion turns the
nwell surface into a p-type, then the E and C
will be shorted by this p-type surface and thus
no PNP transistor is possible
2
LOCOS Oxide vs. Moat Region
3
Si surface is covered either by thin oxide (Moat
region) or thick field oxide (LOCOS oxide)

• N S/D and p S/D implant regions
• Schottky contact region
• N- S/D implant region for the LDD NMOS
• pBase diffusion region
• Channel stop implant region
• Vt adjust implant region
• Deep N Sinker diffusion region
• The region over the nwell-p-epi pn junction
  region
• Region for Poly resistor
• Region for Poly capacitor
• PMOS capacitor region
• Bare surfaces (without any further diffusion) of
  p-epi or nwell
• NMoat or PMoat regions