Electrostatic discharge management apparatus, systems, and methods
View Patent ↗Apparatus, systems, and methods may include managing electrostatic discharge events by using a semiconductor device having a non-aligned gate to implement a snap-back voltage protection mechanism. Such devices may be formed by doping a semiconductor substrate to form a first conductive region as a well, forming one of a source region and a drain region in the well, depositing a layer of polysilicon on the substrate to establish a gating area that does not overlap the one of the source region and the drain region, and forming an integrated circuit supported by the substrate to couple to the one of the source region and the drain region to provide snap-back voltage operation at a node between the integrated circuit and the source or drain region. Additional apparatus, systems, and methods are disclosed.
1. An integrated circuit chip, comprising:
a semiconductor substrate having a source region and a drain region;
an electrical circuit formed on the semiconductor substrate, the electrical circuit coupled to one of the source region or the drain region to provide snap-back voltage operation; and
a gate layer placed on the semiconductor substrate and configured to provide a horizontal gap from one of the source region and the drain region, the horizontal gap defining a region in the semiconductor substrate where the gate layer does not overlap with the source region or the drain region.
2. The integrated circuit chip of claim 1 , wherein one of the source region and the drain region forms a graded junction with the semiconductor substrate.
3. The integrated circuit chip of claim 1 , comprising:
an oxide trench to isolate at least one of the source region and the drain region from a doped region of the semiconductor substrate, wherein the oxide trench is supported by the semiconductor substrate.
4. The integrated circuit chip of claim 1 , comprising:
a p-well implant region to receive only one of the source region or the drain region.
5. The integrated circuit chip of claim 1 , comprising:
a p-well implant region to receive the source region and the drain region.
6. The integrated circuit chip of claim 1 , comprising:
an n-well implant region to receive one of the source region and the drain region.
7. The integrated circuit chip of claim 1 , wherein the electrical circuit comprises a charge pump.
8. The integrated circuit chip of claim 1 , wherein the electrical circuit comprises a memory.
9. The integrated circuit chip of claim 1 , wherein the electrical circuit comprises a processor.
10. The integrated circuit chip of claim 1 , comprising:
a junction diode having a first terminal coupled to the source region and a second terminal coupled to the drain region.
11. An article comprising a non-transitory computer-readable storage medium containing thereon instructions which, if executed by mask making machinery as instructions for processing a semiconductor wafer, an integrated circuit will result on the wafer, comprising:
a semiconductor substrate having a source region and a drain region;
an electrical circuit formed on the semiconductor substrate, the electrical circuit coupled to one of the source region or the drain region to provide snap-back voltage operation; and
a gate layer placed on the semiconductor substrate and configured to provide a horizontal gap from one of the source region and the drain region, the horizontal gap defining a region in the semiconductor substrate where the gate layer does not overlap with the source region or the drain region.
12. The article of claim 11 , wherein of the source region and the drain region forms a graded junction with the semiconductor substrate.
13. The article of claim 11 , wherein the integrated circuit comprises:
an oxide trench to isolate at least one of the source region and the drain region from a doped region of the semiconductor substrate, wherein the oxide trench is supported by the semiconductor substrate.
14. The article of claim 11 , wherein the integrated circuit comprises:
a p-well implant region to receive only one of the source region or the drain region.
15. The article of claim 11 , wherein the integrated circuit comprises:
a p-well implant region to receive the source region and the drain region.
16. The article of claim 11 , wherein the integrated circuit comprises:
an n-well implant region to receive one of the source region and the drain region.
17. The article of claim 11 , wherein the electrical circuit comprises a charge pump.
18. The article of claim 11 , wherein the electrical circuit comprises a memory.
19. The article of claim 11 , wherein the electrical circuit comprises a processor.
20. The article of claim 11 , wherein the integrated circuit comprises:
a junction diode having a first terminal coupled to the source region and a second terminal coupled to the drain region.