Radio frequency identification device electrostatic discharge management
View Patent ↗Apparatus, systems, and methods may include managing electrostatic discharge events in radio frequency identification (RFID) devices by using a semiconductor circuit having a non-aligned gate to implement a snap-back voltage protection mechanism. Such circuits 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 including an RFID circuit that is 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. A radio frequency identification (RFID) tag, comprising:
an antenna;
a semiconductor substrate;
an electrical circuit formed on the semiconductor substrate and coupled to the antenna; and
a gate layer supported by the substrate that does not overlap one of a source region and a drain region included in a semiconductor device coupled to the electrical circuit, wherein the one of the source region and the drain region is to couple to the electrical circuit to provide snap-back voltage operation.
2. The RFID tag of claim 1 , wherein the one of the source region and the drain region forms a graded junction with the semiconductor substrate.
3. The RFID tag 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 substrate.
4. The RFID tag of claim 1 , comprising:
a p-well implant region to receive only one of the source region or the drain region.
5. The RFID tag of claim 1 , comprising:
a p-well implant region to receive the source region and the drain region.
6. The RFID tag of claim 1 , comprising:
an n-well implant region to receive one of the source region and the drain region.
7. The RFID tag of claim 1 , wherein the electrical circuit comprises a charge pump.
8. The RFID tag of claim 1 , wherein the electrical circuit comprises a memory.
9. The RFID tag of claim 1 , wherein the electrical circuit comprises a processor.
10. The RFID tag 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.