US5673002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operational amplifier having stable operations for a wide range of source voltage, and current detector circuit employing a small number of elements
Assignee: Socionext Inc
•
Filing: 1996-08-08
•
Granted: 1997-09-30
•
Expires: 2016-08-08
Abstract
Abstract An operational amplifier has a differential amplification section, an output section, a control signal generation unit, and a drive control unit. The output section has a first transistor of a first conductivity type and a second transistor of a second conductivity type that is opposite to the first conductivity type. The first and second transistors are connected in series between a first power source unit and a second power source unit, and the first transistor is driven according to an output of the differential amplification section. The control signal generation unit is used to detect a current flowing through the first transistor and generate a control signal in response to the detected current. The drive control unit is used to drive the second transistor in response to the control signal.
Inventors
- 👤 Osamu Kobayashi
- 👤 Atsushi Matsuda
- 👤 Tachio Yuasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:55
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343; H03F3/345; H03F1/00; H03F1/30; H03F1/307; H03F1/308; H03F3/30; H03F3/3001; H03F3/3022; H03F3/3023; H03F3/3028
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
A current detector circuit comprising: a first detecting object; a first current detector for detecting a current flowing through said first detecting object; a second detecting object; a second current detector for detecting a current flowing through said second detecting object; and a monitor including a first transistor having a control terminal connected to an output of said first current detector and a second transistor having a second terminal connected to a first terminal of said first transistor and a control terminal connected to an output of said second current detector, said first and second transistors having identical characteristics.
Claim 2
Dependent Claim
99 words
A current detector circuit comprising: a first detecting object; a first current detector for detecting a current flowing through said first detecting object; a second detecting object; a second current detector for detecting a current flowing through said second detecting object; and a monitor including a first transistor having a control terminal connected to an output of said first current detector and a second transistor having a second terminal connected to a first terminal of said first transistor and a control terminal connected to an output of said second current detector, said first and second transistors having identical characteristics.
Claim 3
Dependent Claim
18 words
A current detector circuit as claimed in claim 1, wherein said first detecting object has a third transistor.
Claim 4
Dependent Claim
58 words
A current detector circuit as claimed in claim 2, wherein said first current detector includes: a fourth transistor having a control terminal connected to a control terminal of said third transistor; and a fifth transistor having second and control terminals connected to a second terminal of said fourth transistor and to the control terminal of said first transistor.
Claim 5
Dependent Claim
57 words
A current detector circuit as claimed in claim 1, wherein said current detector circuit further comprises: a first current source connected to a second terminal of said first transistor; and a feedback circuit for fixing currents flowing through said first and second detecting objects in response to a signal from the second terminal of said first transistor.
Claim 6
Dependent Claim
72 words
A current detector circuit as claimed in claim 1, wherein said monitor includes: a sixth transistor having a second terminal connected to the second terminal of said first transistor and a control terminal connected to the control terminal of said second transistor; and a seventh transistor having a control terminal connected to the control terminal of said first transistor and a second terminal connected to a first terminal of said sixth transistor.
Claim 7
Dependent Claim
38 words
A current detector circuit as claimed in claim 5, wherein said first, second, fifth, sixth, and seventh transistors are made of a first conductivity type, and said third and fourth transistors are made of a second conductivity type.
Claim 8
Dependent Claim
34 words
A current detector circuit as claimed in any one of claims 1 to 6, wherein said first terminal is a source, said second terminal is a drain, and said control terminal is a gate.
Claim 9
Dependent Claim
34 words
A current detector circuit as claimed in any one of claims 1 to 6, wherein said first terminal is an emitter, said second terminal is a collector, and said control terminal is a base.
Claim 10
Dependent Claim
25 words
A current detector circuit as claimed in any one of claims 1 to 6, wherein said current detector circuit constitutes part of an operational amplifier.
Claim 11
Dependent Claim
24 words
A current detector circuit as claimed in any one of claims 1-6, wherein said current detector circuit constitutes part of a semiconductor integrated circuit.
References Cited (Backward Citations)
US4644288A
Cited
EP0389654A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-29 | 2001-03-31 | 2001-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-29 | 2005-03-31 | 2005-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-29 | 2009-03-31 | 2009-09-30 | $7700.00 | Window Closed / Lapsed |