10.14 Schottky Diode¶
This section describes the schottky diode for this process. Schottky diode is formed by Co-salicidation and N-type silicon inside DNWELL. Its anode is the COMP under Schottky_diode marking but without Nplus. Its cathode is the NCOMP covered by Schottky_diode marking. Schottky_diode layer can exist both in LV or MV area.
Multi finger devices should be used for lower forward series resistance. Fill whole of anode and cathode COMP with maximum number of contacts to minimize series resistance. Metal width for anode and cathode connections should be maximized.
RULE NO. |
DESCRIPTION |
LAYOUT RULE |
Definitions |
Anode COMP = (COMP AND Schottky_diode) NOT Nplus Cathode COMP = (COMP AND Schottky_diode) AND Nplus |
|
Definitions |
Diode area = Anode area = (COMP AND Schottky_diode) NOT (Nplus OR Pplus) |
Mainly for LVS |
SK.1 |
Min “Schottky_diode” marking layer width |
0.6 |
SK.2 |
Min “Schottky_diode” marking layer space |
0.6 |
SK.3 |
Min “Schottky_diode” marking layer enclose schottky diode anode and cathode COMP |
0.16 |
SK.4 |
Schottky diode shall need both cathode and anode a) Only Cathode COMP or only Anode COMP under “Schottky_diode” Marking is not allowed B) “Schottky_diode” without COMP is not allowed. |
|
SK.5 |
Min/Max schottky diode’s anode COMP to cathode COMP space |
0.28 |
SK.6 |
Min. Schottky diode Anode COMP to Nplus space |
0.16 |
SK.7 |
Min. Schottky diode Anode COMP to Pplus space |
0.16 |
SK.8 |
Min. Schottky diode outside DNWELL is not allowed |
|
SK.9 |
Min. DNWELL enclose schottky diode Anode COMP |
1.4 |
SK.10 |
Min. “Schottky_diode” space to PCOMP |
0.8 |
SK.11 |
Min. “Schottky_diode” space to LVPWELL |
0.9 |
SK.12 |
Poly2 intersect with Schottky_diode mark layer is not allowed |
|
SK.14 |
a) Two anode COMP area must be separated by cathode COMP in the anode width direction (two anode comp can not exist side by side without having cathode COMP in between). B) Cathode COMP length cannot be shorter than that of anode COMP length. |
|
SK.15 |
Min. Anode COMP to Nwell space |
0.16 |
SK.16 |
Min/Max schottky diode anode width (shorter dimension of schottky diode anode COMP) (This is for model accuracy of schottky diode) |
0.62 |
SK.17 |
Each anode must have cathode on both sides of anode width direction |
