Patent US4325019A successfully refreshed from Google Patents.
US4325019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current stabilizer
Assignee: Toshiba Corp
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Filing: 1980-09-19
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Granted: 1982-04-13
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Expires: 2000-09-19
Abstract
Abstract A current stabilizer has a current mirror including first and second terminals through which first and second currents flow. A transistor circuit including a transistor and a resistor is connected to the first terminal so as to cause the first current to flow therein, which first current defines the current which may flow through the second terminal. The biasing of the transistor is selected with respect to the temperature coefficients of the transistor and resistor so that the first current remains constant and temperature independent.
Inventors
- 👤 Hideharu Tezuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:08
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22; G05F3/222; G05F3/225
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A current stabilizing circuit comprising: a current source including first and second terminals, the current flowing through said first terminal controlling the current that may flow through said second terminal; a transistor circuit including a resistor and a transistor having a base and current conducting terminals, said resistor being connected in series with said current conducting terminals, said transistor circuit being connected to said first terminal; and means for controlling the current flowing through said base in relation to the temperature coefficients of said resistor and said transistor to cause the current that may flow through said second terminal to be constant and temperature independent.
Claim 2
Dependent Claim
105 words
A current stabilizing circuit comprising: a current source including first and second terminals, the current flowing through said first terminal controlling the current that may flow through said second terminal; a transistor circuit including a resistor and a transistor having a base and current conducting terminals, said resistor being connected in series with said current conducting terminals, said transistor circuit being connected to said first terminal; and means for controlling the current flowing through said base in relation to the temperature coefficients of said resistor and said transistor to cause the current that may flow through said second terminal to be constant and temperature independent.
Claim 3
Dependent Claim
139 words
A current stabilizing circuit comprising: a current source including first and second terminals, the current flowing through said first terminal controlling the current that may flow through said second terminal; a transistor circuit including a resistor and a transistor having a base and current conducting terminals, said resistor being connected in series with said current conducting terminals, said transistor circuit being connected to said first terminal; means for controlling the current flowing through said base in relation to the temperature coefficients of said resistor and said transistor to cause the current that may flow through said second terminal to be constant and temperature independent; and another current source including third and fourth terminals, said third terminal being connected to said transistor circuit, the current flowing through said third terminal controlling the current that may flow through said fourth terminal.
Claim 4
Dependent Claim
139 words
A current stabilizing circuit comprising: a current source including first and second terminals, the current flowing through said first terminal controlling the current that may flow through said second terminal; a transistor circuit including a resistor and a transistor having a base and current conducting terminals, said resistor being connected in series with said current conducting terminals, said transistor circuit being connected to said first terminal; means for controlling the current flowing through said base in relation to the temperature coefficients of said resistor and said transistor to cause the current that may flow through said second terminal to be constant and temperature independent; and another current source including third and fourth terminals, said third terminal being connected to said transistor circuit, the current flowing through said third terminal controlling the current that may flow through said fourth terminal.
Claim 5
Dependent Claim
31 words
A circuit as in claim 1 or 2 wherein said controlling means comprises second and third resistors connected in series, said transistor base being connected between said second and third resistors.
Claim 6
Dependent Claim
106 words
A current stabilizing circuit comprising: a current source including first and second terminals, the current flowing through said first terminal controlling the current that may flow through said second terminal; a transistor circuit including a resistor and a transistor having a base and current conducting terminals, said resistor being connected in series with said current conducting terminals, said transistor circuit being directly connected to said first terminal; and means for controlling the current flowing through said base in relation to the temperature coefficients of said resistor and said transistor to cause the current that may flow through said second terminal to be constant and temperature independent.
Claim 7
Dependent Claim
106 words
A current stabilizing circuit comprising: a current source including first and second terminals, the current flowing through said first terminal controlling the current that may flow through said second terminal; a transistor circuit including a resistor and a transistor having a base and current conducting terminals, said resistor being connected in series with said current conducting terminals, said transistor circuit being directly connected to said first terminal; and means for controlling the current flowing through said base in relation to the temperature coefficients of said resistor and said transistor to cause the current that may flow through said second terminal to be constant and temperature independent.
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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |