US4503343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active pull-up circuit
Assignee: Toshiba Corp
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Filing: 1982-09-24
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Granted: 1985-03-05
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Expires: 2002-09-24
Abstract
Abstract Provided is an active pull-up circuit which comprises a MOS capacitor having one end connected to an input terminal receiving a pull-up signal, a first MOS transistor having a current path connected between the other end of said MOS capacitor and a signal line precharged, during a precharge period, up to a power source voltage level, and a second MOS transistor having a current path connected between a power source terminal and the signal line and having a gate connected to a source of the first MOS transistor. To the gate of this first MOS transistor there is applied a control voltage which, during the precharge period, is higher in level than a sum of the power source voltage and a threshold voltage of the first MOS transistor and, after the lapse of the precharge period, is substantially equal in level to the power source voltage.
Inventors
- 👤 Kazunori Ohuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:46
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/401; G11C11/4063; G11C11/407; G11C11/409; G11C11/4094
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
213 words
An active pull-up circuit comprising: a power source terminal connected for receiving a power source voltage; an input terminal connected for receiving a pull-up signal which is generated after a precharge period; capacitive means having a first end connected to said input terminal; a first MOS transistor having a current path connected between a second end of said capacitive means and a signal line; a second MOS transistor having a current path connected between said power source terminal and signal line and having a gate connected to a junction between said capacitive means and first MOS transistor, said signal line being precharged through said second MOS transistor to a power source voltage level during said precharge period; and control means for supplying a first output voltage to a gate of said first MOS transistor in response to a precharge signal which is generated during said precharge period, said first output voltage being kept higher than the sum of the power source voltage and a threshold voltage of said first MOS transistor, and supplying a second output voltage to the gate of said MOS transistor in response to a control signal which is generated after the lapse of said precharge period, said second output voltage being kept substantially equal to the power source voltage.
Claim 2
Dependent Claim
213 words
An active pull-up circuit comprising: a power source terminal connected for receiving a power source voltage; an input terminal connected for receiving a pull-up signal which is generated after a precharge period; capacitive means having a first end connected to said input terminal; a first MOS transistor having a current path connected between a second end of said capacitive means and a signal line; a second MOS transistor having a current path connected between said power source terminal and signal line and having a gate connected to a junction between said capacitive means and first MOS transistor, said signal line being precharged through said second MOS transistor to a power source voltage level during said precharge period; and control means for supplying a first output voltage to a gate of said first MOS transistor in response to a precharge signal which is generated during said precharge period, said first output voltage being kept higher than the sum of the power source voltage and a threshold voltage of said first MOS transistor, and supplying a second output voltage to the gate of said MOS transistor in response to a control signal which is generated after the lapse of said precharge period, said second output voltage being kept substantially equal to the power source voltage.
Claim 3
Dependent Claim
16 words
An active pull-up circuit according to claim 1, wherein said capacitive means is a MOS capacitor.
Claim 4
Dependent Claim
294 words
An active pull-up circuit comprising: a power source terminal connected for receiving a power source voltage; an input terminal connected for receiving a pull-up signal which is generated after a precharge period; capacitive means having a first end connected to said input terminal; a first MOS transistor having a current path connected between a second end of said capacitive means and a signal line; a second MOS transistor having a current path connected between said power source terminal and signal line and having a gate connected to a junction between said capacitive means and first MOS transistor, said signal line being precharged through said second MOS transistor to a power source voltage level during said precharge period; and control means including a third MOS transistor having its gate and drain connected to said power source terminal, a capacitor having one end connected to a source of said third MOS transistor and receiving at the other end a control signal which is generated after the lapse of said precharge period, a fourth MOS transistor having a gate connected to the source of said third MOS transistor, a source connected to the gate of said first MOS transistor and a drain connected to said power source terminal, and a capacitor having a first end connected to the source of said fourth MOS transistor and receiving at a second end a precharge signal which is generated during said precharge period, wherein said control means supplies to the gate of said first MOS transistor a voltage which, during said precharge period, is kept higher than the sum of the power source voltage and a threshold voltage of said first MOS transistor and, after the lapse of said precharge period, is kept substantially equal to the power source voltage.
Claim 5
Dependent Claim
294 words
An active pull-up circuit comprising: a power source terminal connected for receiving a power source voltage; an input terminal connected for receiving a pull-up signal which is generated after a precharge period; capacitive means having a first end connected to said input terminal; a first MOS transistor having a current path connected between a second end of said capacitive means and a signal line; a second MOS transistor having a current path connected between said power source terminal and signal line and having a gate connected to a junction between said capacitive means and first MOS transistor, said signal line being precharged through said second MOS transistor to a power source voltage level during said precharge period; and control means including a third MOS transistor having its gate and drain connected to said power source terminal, a capacitor having one end connected to a source of said third MOS transistor and receiving at the other end a control signal which is generated after the lapse of said precharge period, a fourth MOS transistor having a gate connected to the source of said third MOS transistor, a source connected to the gate of said first MOS transistor and a drain connected to said power source terminal, and a capacitor having a first end connected to the source of said fourth MOS transistor and receiving at a second end a precharge signal which is generated during said precharge period, wherein said control means supplies to the gate of said first MOS transistor a voltage which, during said precharge period, is kept higher than the sum of the power source voltage and a threshold voltage of said first MOS transistor and, after the lapse of said precharge period, is kept substantially equal to the power source voltage.
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) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |