US4401899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current comparator circuit
Assignee: Sony Corp
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Filing: 1980-12-05
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Granted: 1983-08-30
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Expires: 2000-12-05
Abstract
Abstract A current comparator circuit is composed of an input signal current source, plural pairs each consisting of a diode and reference current source, and plural switching elements. The pairs each consisting of a diode and reference current source are connected in series or in parallel to the input signal current source. Each switching element is a transistor, which is connected to the connection point between the paired diode and reference current source, and a compared output can be obtained from the collector of the transistor.
Inventors
- 👤 Takashi Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:40
CPC Classifications
H; H03; H03M; H03M1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
202 words
A current comparator circuit comprising an input signal current source, a first reference current source with one side connected to a reference potential and its second side connected to said input current source, a first diode with its first side connected to the second side of said first reference current source, a second reference current source with a first side connected to a reference potential, a second diode with a first side connected to the second sides of said first diode and the second side of said second reference current source, the second side of said second diode coupled to reference potential, a first comparator output circuit including a first switching transistor with a control electrode, a second electrode and a third electrode with the control electrode connected to said input signal current source and to the first side of said first diode, an output terminal connected to said second electrode, said third electrode coupled to reference potential, a second transistor with a control electrode, a second electrode and a third electrode with said control electrode connected to the first side of said second diode, a second output terminal connected to said second electrode and said third electrode coupled to reference potential.
Claim 2
Dependent Claim
202 words
A current comparator circuit comprising an input signal current source, a first reference current source with one side connected to a reference potential and its second side connected to said input current source, a first diode with its first side connected to the second side of said first reference current source, a second reference current source with a first side connected to a reference potential, a second diode with a first side connected to the second sides of said first diode and the second side of said second reference current source, the second side of said second diode coupled to reference potential, a first comparator output circuit including a first switching transistor with a control electrode, a second electrode and a third electrode with the control electrode connected to said input signal current source and to the first side of said first diode, an output terminal connected to said second electrode, said third electrode coupled to reference potential, a second transistor with a control electrode, a second electrode and a third electrode with said control electrode connected to the first side of said second diode, a second output terminal connected to said second electrode and said third electrode coupled to reference potential.
Claim 3
Dependent Claim
67 words
A current comparator according to claim 1, wherein said first constant current source comprises third and fourth transistors with their bases connected together, second electrodes of each of said third and fourth transistors connected together, the third electrode of said third transistor connected to the bases of said third and, fourth transistors, a first resistor connected between said third electrode of said third transistor and reference potential.
Claim 4
Dependent Claim
216 words
A current comparator circuit comprising, an input current source with one side connected to a reference potential, a first constant current source with one side connected to said reference potential and the second side connected to the second side of said input current source, a first diode with one side connected to said second side of said first constant current source, a second constant current source with one side connected to reference potential and the second side connected to the second side of said first diode, a second diode with its first side connected to the second side of said second constant current source and its second side coupled to said reference potential, a first transistor with first, second and third electrodes with its first electrode connected to said one side of said first diode, a first load connected between the second electrode of said first transistor and said reference potential, a first output terminal connected to the third electrode of said first transistor, a second transistor with first, second and third electrodes with the first electrode connected to said one side of said second diode, a second load connected between the second electrode of said second transistor and said reference potential, and a second output terminal connected to a third electrode of said second transistor.
Claim 5
Dependent Claim
216 words
A current comparator circuit comprising, an input current source with one side connected to a reference potential, a first constant current source with one side connected to said reference potential and the second side connected to the second side of said input current source, a first diode with one side connected to said second side of said first constant current source, a second constant current source with one side connected to reference potential and the second side connected to the second side of said first diode, a second diode with its first side connected to the second side of said second constant current source and its second side coupled to said reference potential, a first transistor with first, second and third electrodes with its first electrode connected to said one side of said first diode, a first load connected between the second electrode of said first transistor and said reference potential, a first output terminal connected to the third electrode of said first transistor, a second transistor with first, second and third electrodes with the first electrode connected to said one side of said second diode, a second load connected between the second electrode of said second transistor and said reference potential, and a second output terminal connected to a third electrode of said second transistor.
Claim 6
Dependent Claim
193 words
A current comparator circuit comprising an input signal current source, a first transistor with first, second and third electrodes with said first electrode connected to said input signal source, a first diode with a first side connected to said first electrode of said first transistor, a first constant current source with a first side connected to said first electrode of said first transistor, a first output terminal connected to said second electrode of said first transistor, said third electrode of said first transistor coupled to a reference potential, a second transistor with first, second and third electrodes with said first electrode connected to second sides of said first diode and said first constant current source, a second diode with a first side connected to said first electrode of said second transistor, a second constant current source with a first side connected to said first side of said second diode, the second sides of said second diode and said second constant current source coupled to a reference potential, a second output terminal connected to said second electrode of said second transistor, and the third electrode of said second electrode coupled to a reference potential.
Claim 7
Dependent Claim
193 words
A current comparator circuit comprising an input signal current source, a first transistor with first, second and third electrodes with said first electrode connected to said input signal source, a first diode with a first side connected to said first electrode of said first transistor, a first constant current source with a first side connected to said first electrode of said first transistor, a first output terminal connected to said second electrode of said first transistor, said third electrode of said first transistor coupled to a reference potential, a second transistor with first, second and third electrodes with said first electrode connected to second sides of said first diode and said first constant current source, a second diode with a first side connected to said first electrode of said second transistor, a second constant current source with a first side connected to said first side of said second diode, the second sides of said second diode and said second constant current source coupled to a reference potential, a second output terminal connected to said second electrode of said second transistor, and the third electrode of said second electrode coupled to a reference potential.
Claim 8
Dependent Claim
188 words
A current comparator circuit comprising an input signal current source, a first diode with a first side connected to said input current source, a first constant current source with a first side connected to the second side of said first diode and a second side connected to a reference potential, a first transistor with first, second and third electrodes with the first electrode connected to the second side of said first diode, a first output terminal connected to the second electrode of said first transistor, and a first biasing source connected to the third electrode of said first transistor, a second diode with a first side connected to said input signal source, a second constant current source with a first side connected to the second side of said second diode and a second side connected to a reference potential, a second transistor with first, second and third electrodes with the first electrode connected to the second side of said second diode, a second output terminal connected to the second electrode of said second transistor and a second biasing source connected to the third electrode of said second transistor.
Claim 9
Dependent Claim
188 words
A current comparator circuit comprising an input signal current source, a first diode with a first side connected to said input current source, a first constant current source with a first side connected to the second side of said first diode and a second side connected to a reference potential, a first transistor with first, second and third electrodes with the first electrode connected to the second side of said first diode, a first output terminal connected to the second electrode of said first transistor, and a first biasing source connected to the third electrode of said first transistor, a second diode with a first side connected to said input signal source, a second constant current source with a first side connected to the second side of said second diode and a second side connected to a reference potential, a second transistor with first, second and third electrodes with the first electrode connected to the second side of said second diode, a second output terminal connected to the second electrode of said second transistor and a second biasing source connected to the third electrode of said second transistor.
References Cited (Backward Citations)
US3138760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |