US5602794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable stage charge pump
Assignee: Micron Technology Inc
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Filing: 1995-09-29
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Granted: 1997-02-11
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Expires: 2015-09-29
Abstract
Abstract A variable stage charge pump for a flash memory device is described. The variable stage charge pump includes a first charge pump and a second charge pump. A first switch couples an output of the first charge pump to an input of the second charge pump. A second switch couples an input of the first charge pump to the input of the second charge pump. The first and second charge pumps are series-coupled to a common output node when the first switch is in a first position and the second switch is in a second position, wherein the first and second charge pumps are parallel-coupled to the common output node when the first switch is in the second position and the second switch is in the first position.
Inventors
- 👤 Jahanshir J. Javanifard
- 👤 Kerry D. Tedrow
- 👤 Jin-lien Lin
- 👤 Jeffrey J. Evertt
- 👤 Gregory E. Atwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:36
CPC Classifications
G; G11; G11C; G11C16/00; G11C16/02; G11C16/06; G11C16/30; G11C7/00; G11C5/00; G11C5/14; G11C5/145; H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07; H02M1/00; H02M1/0067; H02M1/007; H02M3/22; H02M3/24; H02M3/28; H02M3/285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A variable stage charge pump comprising: a first charge pump; a second charge pump; a first switch coupling an output of the first charge pump to an input of the second charge pump; a second switch coupling an input of the first charge pump to the input of the second charge pump; wherein the first and second charge pumps are series-coupled to a common output node when the first switch is in a first position and the second switch is in a second position, wherein the first and second charge pumps are parallel-coupled to the common output node when the first switch is in the second position and the second switch is in the first position.
Claim 2
Dependent Claim
116 words
A variable stage charge pump comprising: a first charge pump; a second charge pump; a first switch coupling an output of the first charge pump to an input of the second charge pump; a second switch coupling an input of the first charge pump to the input of the second charge pump; wherein the first and second charge pumps are series-coupled to a common output node when the first switch is in a first position and the second switch is in a second position, wherein the first and second charge pumps are parallel-coupled to the common output node when the first switch is in the second position and the second switch is in the first position.
Claim 3
Dependent Claim
53 words
The variable stage charge pump of claim 1 further comprising: a first diode-connected metal-oxide semiconductor field-effect transistor coupled between the output of the first charge pump and the common output node; and a second diode-connected metal-oxide semiconductor field-effect transistor coupled between an output of the second charge pump and the common output node.
Claim 4
Dependent Claim
22 words
The variable stage charge pump of claim 1 wherein the first and second switches further comprise low threshold voltage metal-oxide semiconductor transistors.
Claim 5
Dependent Claim
25 words
The variable stage charge pump of claim 1 wherein at least one of the first and second charge pumps includes a plurality of series-coupled stages.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |