4.4 Example Editing

• To create a basic transistor with minimum feature size: (1.2 micron technology)


 Note:In the working space, one unit is equal to one Lambda. (refer to the cursor coordination on the window frame). If you follow the Lambda rules for 1.2 micron technology, the smallest feature size will be 2 Lambda (for poly width and contact size). Therefore we have 1 Lambda = 0.6micron
 
 

1. Follow steps in section 4.1 Add Layer to create one 2x2Lambda contact square.

 

 

2. Also create 6x6 metal1 square for contact.  The result should look like Fig 4.7.

 

 



 Figure 4-7. Start your design from contact
3. Copy and place all these shapes beside the original ones with 4 Lambda spacing. They are source and drain contacts.



 Figure 4-8. Source and Drain Contacts with minimum feature size.
4. Create 2x10 poly between these two contact-metals with 1 Lambda spacing.



 Figure 4-9. Gate between source and drain contact.
5. Create 6x16 aa(active area) to cover exactly source and drain metal-contact.



 Figure 4-10. Add 'aa' layer
6. Add 10x20 pplus for PMOS and 10x20 nplus for NMOS. The spacing between nplus and pplus should be kept at least 9 Lambda apart for correct Nwell and Pwell spacing.

 

 



 Figure 4-11. PMOS and NMOS transistors
7. Add 18x28 nwell for PMOS and 18x28 pwell for NMOS. The spacing between nwell and pwell should be at least 1 Lambda.

 

 



 Figure 4-12. Add nwell and pwell
8. Add metal1: VCC (power wire) and GND (ground wire). Note that metal1 should have at least 3 Lambda width and 3 Lambda spacing(metal1 to metal1 spacing).

 

 



 Figure 4-13. Add VCC and GND
9. Now, connect PMOS-source to VCC and that of NMOS to GND with metal1. (Use 'Notch in' skill)

 

 



 Figure 4-14. Connect sources to VCC and GND
10. Extend and connect the poly layer from both transistors then connect the poly layers of both transistors by metal1 as shown in Fig 4-15

 

 

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