US4930037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input voltage protection system
Assignee: Advanced Micro Devices Inc
•
Filing: 1989-02-16
•
Granted: 1990-05-29
•
Expires: 2009-02-16
Abstract
Abstract A static electricity protection system for use with a voltage sensitive MOS component having a gate input including a layer of oxide. A transmission gate having a source and a drain as an input and output, respectively, is connected to the MOS component gate input for protecting it from sudden electrical voltage surge discharges. The transmission gate source and drain include a layer of oxide substantially thicker than the oxide layer of the MOS component gate input.
Inventors
- 👤 Ann K. Woo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:33
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0812; H03K17/08122; H03K17/16; H03K17/161; H03K17/162; H10; H10D; H10D89/00; H10D89/60; H10D89/601
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A static electricity protection system for use with a voltage sensitive MOS component having a gate input with predetermined oxide layer thickness, the protection system comprising: (a) a MOS component having a gate input; and (b) a transmission gate having a source and a drain as an input and output, respectively, said transmission gate being connected to said MOS component gate input and having a higher voltage capacity than said MOS component for absorbing and for protecting said MOS component from sudden electrical voltage surge discharges.
Claim 2
Dependent Claim
86 words
A static electricity protection system for use with a voltage sensitive MOS component having a gate input with predetermined oxide layer thickness, the protection system comprising: (a) a MOS component having a gate input; and (b) a transmission gate having a source and a drain as an input and output, respectively, said transmission gate being connected to said MOS component gate input and having a higher voltage capacity than said MOS component for absorbing and for protecting said MOS component from sudden electrical voltage surge discharges.
Claim 3
Dependent Claim
35 words
The static electricity protection system in accordance with claim 1 wherein said transmission gate source and drain comprise a layer of oxide substantially thicker than said predetermined oxide layer of said MOS component gate input.
Claim 4
Dependent Claim
28 words
The static electricity protection system in accordance with claim 2 further comprising: (c) an ESD circuit connected to said gate input for slowly discharging static electricity applied thereto.
Claim 5
Dependent Claim
18 words
The static electricity protection system in accordance with claim 2 wherein said transmission gate is an N-channel device.
Claim 6
Dependent Claim
26 words
The static electricity protection system in accordance with claim 2 wherein said transmission gate is an N-channel and P-channel device connected to one another in parallel.
Claim 7
Dependent Claim
21 words
The static electricity protection system in accordance with claim 2 wherein said MOS component oxide layer thickness is approximately 250 Å.
Claim 8
Dependent Claim
24 words
The static electricity protection system in accordance with claim 6 wherein said transmission gate source and drain oxide layer thickness is approximately 3500 Å.
Claim 9
Dependent Claim
18 words
The static electricity protection system in accordance with claim 1 wherein said MOS component is a CMOS component.
References Cited (Backward Citations)
US3947727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |