CMOS EPROM and EEPROM devices and programmable CMOS inverters
View Patent ↗A CMOS EPROM, EEPROM or inverter device includes an nFET device with a thin gate dielectric layer and a pFET device juxtaposed with the nFET device with a thick gate dielectric layer and a floating gate electrode. The thick gate dielectric layer is substantially thicker than the thin gate dielectric layer. A common drain node connected both FET devices has no external connection in the case of a memory device and has an external connection in the case of an inverter. There are external circuit connections to the source regions of both FET devices and to the gate electrode of the nFET device. The pFET and nFET devices can be planar, vertical or FinFET devices.
1. A CMOS device comprising:
a substrate;
a semiconductor nFET formed in and/or upon said substrate including a first source region, a first channel region, and a first drain region;
a thin gate dielectric layer formed above said first channel region and a first gate electrode formed above said thin gate dielectric layer;
a semiconductor pFET device formed in and/or upon said substrate juxtaposed with said nFET device and including a second source region, a second channel region, and a second drain region;
a thick gate dielectric layer formed above said second channel region and a floating gate electrode formed above said thick gate dielectric layer, with said thick gate dielectric layer being substantially thicker than said thin gate dielectric layer in order to be resistant to unwanted tunneling of charge therethrough;
a common drain node connected both to said first drain region and to said second drain region with no external connection to said common drain node in the case of a memory device and with an external connection to said common drain node in the case of an inverter; and
external circuit connections to said first source region and to said second source region and to said first gate electrode.
2. The CMOS device of claim 1 wherein said substrate includes a Silicon on Insulator (SOI) layer formed on bulk silicon.
3. The CMOS device of claim 1 wherein said substrate includes an N-well for said pFET and a P-well for said nFET.
4. The CMOS device of claim 1 wherein said device comprises an EPROM memory.
5. The CMOS device of claim 4 wherein said substrate includes a Silicon on Insulator (SOI) layer formed on bulk silicon.
6. The CMOS device of claim 4 wherein said substrate includes an N-well for said pFET and a P-well for said nFET.
7. The CMOS device of claim 1 wherein said device comprises an EEPROM memory.
8. The CMOS device of claim 7 wherein said substrate includes an Silicon on Insulator (SOI) layer formed on bulk silicon.
9. The CMOS device of claim 7 wherein said substrate includes an N-well for said pFET and a P-well for said nFET.
10. The CMOS device of claim 1 wherein said device comprises a programmable inverter.
11. The CMOS device of claim 10 wherein said substrate includes an Silicon on Insulator (SOI) layer formed on bulk silicon.
12. The CMOS device of claim 10 wherein said substrate includes an N-well for said pFET and a P-well for said nFET.
13. The CMOS device of claim 10 including an additional pFET device with a thin gate dielectric layer formed in parallel with said semiconductor pFET.
14. A CMOS memory device comprising:
a substrate;
a semiconductor nFET device formed in and/or upon said substrate including a first source region, a first channel region, and a first drain region;
a thin gate dielectric layer formed above said first channel region and a first gate electrode formed above said thin gate dielectric layer;
a semiconductor pFET device formed in and/or upon said substrate juxtaposed with said nFET device and including a second source region, a second channel region, and a second drain region;
a thick gate dielectric layer formed above said second channel region and a floating gate electrode formed above said thick gate dielectric layer, with said thick gate dielectric layer being substantially thicker than said thin gate dielectric layer in order to be resistant to unwanted tunneling of charge therethrough;
a common drain node connected both to said first drain region and to said second drain region with no external connection to said common drain node; and
external circuit connections to said first source region and to said second source region and to said first gate electrode.
15. The CMOS memory device of claim 14 wherein said device comprises an EPROM memory.
16. The CMOS memory device of claim 14 wherein said device comprises an EEPROM memory.
17. A CMOS programmable inverter comprising:
a substrate;
a semiconductor nFET device formed in and/or upon said substrate including a first source region, a first channel region, and a first drain region;
a thin gate dielectric layer formed above said first channel region and a first gate electrode formed above said thin gate dielectric layer;
a semiconductor pFET device formed in and/or upon said substrate juxtaposed with said nFET device and including a second source region, a second channel region, and a second drain region;
a thick gate dielectric layer formed above said second channel region and a floating gate electrode formed above said thick gate dielectric layer, with said thick gate dielectric layer being substantially thicker than said thin gate dielectric layer in order to be resistant to unwanted tunneling of charge therethrough;
a common drain node connected both to said first drain region and to said second drain region; and
external circuit connections to said first source region and to said second source region and to said first gate electrode and to said common drain node with said common drain node comprising an output of said inverter.
18. The CMOS programmable inverter of claim 17 wherein said substrate is selected from the group consisting of an Silicon-On-Insulator (SOI) and an N-well for said pFET and a P-well for said nFET.
19. The CMOS device of programmable inverter of claim 17 including an additional pFET device with a thin gate dielectric layer formed in parallel with said semiconductor pFET.
20. The CMOS device of programmable inverter of claim 18 including an additional pFET device with a thin gate dielectric layer formed in parallel with said semiconductor pFET.
21. The CMOS device of claim 1 wherein at least one of said semiconductor pFET device and said semiconductor nFET device comprises a vertical FET.
22. The CMOS device of claim 1 wherein at least one of said semiconductor pFET device and said semiconductor nFET device comprises a FinFET.
23. The CMOS memory device of claim 14 wherein at least one of said semiconductor pFET device and said semiconductor nFET device comprises a vertical FET.
24. The CMOS memory device of claim 14 wherein at least one of said semiconductor pFET device and said semiconductor nFET device comprises a FinFET.
25. The inverter of claim 17 wherein at least one of said semiconductor pFET device and said semiconductor nFET device comprises a vertical FET or a FinFET.