US5187397A
Expired / Lapsed
US
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Integrated semiconductor circuit with improved boost operation speed
Assignee: Fujitsu VLSI Ltd
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Filing: 1992-03-18
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Granted: 1993-02-16
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Expires: 2012-03-18
Abstract
Abstract An integrated semiconductor circuit has a boost circuit that may improve boost operation speed. The boost circuit employs a P-channel type transistor as a driver. The back gate of the P-channel type transistor is connected to a charge-up circuit so that the back gate may be charged to a predetermined level before a boost signal is applied to the driver.
Inventors
- 👤 Miki Nishimori
- 👤 Teruo Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:57
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/24; G11C11/401; G11C11/4063; G11C11/407; G11C11/4074; G11C5/00; G11C5/14; G11C5/145; G11C8/00; G11C8/08; G11C8/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
An integrated semiconductor circuit employing a boost circuit for generating a voltage higher than a high potential power source, said boost circuit comprising: a P-channel type transistor as a driver for driving a boosted signal(b) with a boost signal (a); and a charge-up means for charging a back gate of said P-channel type transistor to a predetermined level in advance of the application of said boost signal to said P-channel type transistor.
Claim 2
Dependent Claim
72 words
An integrated semiconductor circuit employing a boost circuit for generating a voltage higher than a high potential power source, said boost circuit comprising: a P-channel type transistor as a driver for driving a boosted signal(b) with a boost signal (a); and a charge-up means for charging a back gate of said P-channel type transistor to a predetermined level in advance of the application of said boost signal to said P-channel type transistor.
Claim 3
Dependent Claim
111 words
An integrated semiconductor circuit as set forth in claim 1, wherein said boost circuit comprises a N-channel type transistor having a gate and a drain connected to said high potential power source, and a source connected to a source of said P-channel type transistor; said P-channel type transistor has a drain connected to a substrate, the back gate to which a signal from said charge-up means to turn ON said P-channel type transistor before boosting is applied, and a gate to which an input signal is applied and the node between said N-channel type transistor and said P-channel type transistor is connected to an output of a boost signal generating means.
Claim 4
Dependent Claim
23 words
An integrated semiconductor circuit as set forth in claim 2, wherein said boost signal generating means comprises an oscillation means and a capacitor.
Claim 5
Dependent Claim
30 words
An integrated semiconductor circuit as set forth in claim 1, wherein said charge-up means for the back gate of said P-channel type transistor comprises an oscillation means and a capacitor.
Claim 6
Dependent Claim
28 words
An integrated semiconductor circuit as set forth in claim 1, wherein said charge-up means for the back gate of said P-channel type transistor comprises a constant voltage source.
Claim 7
Dependent Claim
46 words
An integrated semiconductor circuit as set forth in claim 4, wherein said charge-up means further comprises an N-channel type transistor having a drain and a gate connected to the high potential power source and a source connected to the back gate of said P-channel type transistor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-02-16 | 1996-08-17 | 1997-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-16 | 2000-08-17 | 2001-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-16 | 2004-08-17 | 2005-02-16 | $7700.00 | Window Closed / Lapsed |