US5180928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant voltage generation of semiconductor device
Assignee: Samsung Electronics Co Ltd
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Filing: 1991-09-30
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Granted: 1993-01-19
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Expires: 2011-09-30
Abstract
Abstract A constant voltage generator of a semiconductor device includes an oscillator for generating an AC signal, a charge pump for pumping charge from a power voltage supply line by a predetermined pumping ratio in accordance with the AC signal of the oscillator, a charge storage capacitor for storing the pumped charge, and a voltage limiter for limiting the voltage across the charge storage capacitor at a predetermined voltage level, then outputting a constant voltage. According to the present invention, the charge of the storage capacitor is quickly stored, a constant voltage is obtained independent of a power source voltage, and the reference voltage output can be greater than the power source voltage.
Inventors
- 👤 Yun-ho Choi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:30
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07; H02M3/073; G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/205
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
181 words
A constant voltage generator of a semiconductor device comprising: an oscillator for generating an AC signal; a charge pump for pumping a charge from a power voltage supply line by a predetermined pumping ratio in accordance with the AC signal of said oscillator; a charge storage capacitor for storing the charge pumped by said charge pump; and a voltage limiter for limiting the voltage across said charge storage capacitor to a predetermined voltage, and outputting a constant voltage, wherein said charge pump is formed by a plurality of stages each including: an amplifier for amplifying said AC signal supplied from a preceding stage, which also delays said AC signal for a predetermined time interval; a pump capacitor for storing a charge while the state of said amplifier's output is low, and for discharging during the output's high state of the output; a first pump diode for supplying the charge from said power voltage supply line to said pump capacitor; and a second pump diode for supplying the charge stored in said pump capacitor to the pump capacitor of a succeeding stage.
Claim 2
Dependent Claim
181 words
A constant voltage generator of a semiconductor device comprising: an oscillator for generating an AC signal; a charge pump for pumping a charge from a power voltage supply line by a predetermined pumping ratio in accordance with the AC signal of said oscillator; a charge storage capacitor for storing the charge pumped by said charge pump; and a voltage limiter for limiting the voltage across said charge storage capacitor to a predetermined voltage, and outputting a constant voltage, wherein said charge pump is formed by a plurality of stages each including: an amplifier for amplifying said AC signal supplied from a preceding stage, which also delays said AC signal for a predetermined time interval; a pump capacitor for storing a charge while the state of said amplifier's output is low, and for discharging during the output's high state of the output; a first pump diode for supplying the charge from said power voltage supply line to said pump capacitor; and a second pump diode for supplying the charge stored in said pump capacitor to the pump capacitor of a succeeding stage.
Claim 3
Dependent Claim
31 words
A constant voltage generator of a semiconductor device as claimed in claim 1, wherein said generator is a ring oscillator formed by a cascaded connection of a plurality of CMOS inverters.
Claim 4
Dependent Claim
43 words
A constant voltage generator of a semiconductor device as claimed in claim 1, wherein said first and second pump diodes are formed by any one of a PN junction diode, a MOS transistor serving as a diode, and any other unipolar current-conductive device.
Claim 5
Dependent Claim
31 words
A constant voltage generator of a semiconductor device as claimed in claim 1, wherein said voltage limiter sets a predetermined level by a voltage drop of a plurality of forward-biased diodes.
Claim 6
Dependent Claim
34 words
A constant voltage generator of a semiconductor device as claimed in claim 1, wherein said voltage limiter sets a predetermined level by the threshold voltage of a plurality of MOS transistors serving as diodes.
Claim 7
Dependent Claim
31 words
A constant voltage generator of a semiconductor device as claimed in claim 1, wherein said a zener diode. oscillator and said voltage limiter are enabled by an enable signal supplied externally.
Claim 8
Dependent Claim
28 words
A constant voltage generator of a semiconductor device as claimed in claim 1, wherein said oscillator and said voltage limiter are enabled by an enable signal supplied externally.
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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) | 1996-01-19 | 1996-07-20 | 1997-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-19 | 2000-07-20 | 2001-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-19 | 2004-07-20 | 2005-01-19 | $7700.00 | Window Closed / Lapsed |