US5036269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage stabilizer with a very low voltage drop designed to withstand high voltage transients
Assignee: STMicroelectronics SRL
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Filing: 1989-12-28
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Granted: 1991-07-30
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Expires: 2009-12-28
Abstract
Abstract A voltage stabilizer with a very low voltage drop includes a series voltage regulator circuit having a first PNP transistor connected to an input terminal of the stabilizer via a second PNP transistor and being connected to ground via a capacitor. The stabilizer has biasing and switching circuits disposed between the input terminal thereof, a base terminal of the second transistor and ground.
Inventors
- 👤 Bruno Murari
- 👤 Marco Morelli
- 👤 Giampietro Maggioni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:44
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/571
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A monolithically integratable voltage stabilizer comprising: a first bipolar transistor of a first type of conductivity having an emitter terminal which is connected to ground via a capacitor, and having a collector terminal which forms an output terminal of the stabilizer, and having a base terminal; a differential amplifier having an output terminal which is connected to said base terminal of said first bipolar transistor and having a first input terminal which is connected to a voltage divider connected between said output terminal of the stabilizer and ground, and having a second input terminal which is connected to a first voltage reference; a second bipolar transistor of said first type of conductivity having an emitter terminal which forms an input terminal of the stabilizer, and having a collector terminal which is connected to said emitter terminal of said first transistor and having a base terminal which is connected to a biasing and switching circuit means disposed between said base terminal of said second transistor and ground and said input terminal of the stabilizer.
Claim 2
Dependent Claim
173 words
A monolithically integratable voltage stabilizer comprising: a first bipolar transistor of a first type of conductivity having an emitter terminal which is connected to ground via a capacitor, and having a collector terminal which forms an output terminal of the stabilizer, and having a base terminal; a differential amplifier having an output terminal which is connected to said base terminal of said first bipolar transistor and having a first input terminal which is connected to a voltage divider connected between said output terminal of the stabilizer and ground, and having a second input terminal which is connected to a first voltage reference; a second bipolar transistor of said first type of conductivity having an emitter terminal which forms an input terminal of the stabilizer, and having a collector terminal which is connected to said emitter terminal of said first transistor and having a base terminal which is connected to a biasing and switching circuit means disposed between said base terminal of said second transistor and ground and said input terminal of the stabilizer.
Claim 3
Dependent Claim
29 words
A voltage stabilizer as claimed in claim 1, wherein said biasing and switching circuit means comprises a switch disposed between said base terminal of said second transistor and ground.
Claim 4
Dependent Claim
53 words
A voltage stabilizer as claimed in claim 2, wherein said switch comprises a transistor included in a current mirror circuit having an input branch connected both to a second voltage reference and to said input terminal of the stabilizer and having an output branch connected to said base terminal of said second transistor.
Claim 5
Dependent Claim
52 words
A voltage stabilizer as claimed in claim 2, wherein said biasing and switching circuit means comprises a threshold comparator circuit means for opening said switch when a potential at said input terminal of the stabilizer is lower than a first predetermined value and when it is greater than a second predetermined value.
Claim 6
Dependent Claim
31 words
A voltage stabilizer as claimed in claim 1, wherein said first transistor comprises a PNP transistor with an isolated vertical collector and wherein a second transistor comprises a lateral PNP transistor.
References Cited (Backward Citations)
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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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |