US3831040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature-dependent current supplier
Assignee: Minolta Co Ltd
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Filing: 1972-11-10
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Granted: 1974-08-20
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Expires: 1992-11-10
Abstract
Abstract A temperature-dependent current supplier specially suitable for application to an integrated circuit is characterized as follows. The base of a first transistor is connected to a connecting point between two resistors which are connected in series to each other in a collector circuit of said transistor, the voltage between the base and the collector of said transistor being selected at about kT/q where the charge quantity is q, the Boltzmann''s constant is k and the absolute temperature is T; and the base of a second transistor is connected to the collector of said first transistor, respective temperature coefficients of the baseemitter voltages of said first and second transistors being selected to differ from each other; and also current-outputs of the quantity proportional to the absolute temperature is taken out from the collector circuit of said second transistor.
Inventors
- 👤 Y Nanba
- 👤 M Sahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:28
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A temperature dependent current supply circuit comprising first and second transistors, a source of supply voltage, first and second resistors connected in series to said first transistor across said source of supply voltage, the base of said second transistor being connected to the collector of said first transistor, the base of said first transistor being connected to a point between said first and second resistors, a third resistor connected in series with the emitter of said second transistor to one side of said source of supply voltage and a load connected in series with the collector of said second transistor to the other side of said source, said first and second resistors having values such that the base-collector Voltage of said first transistor is approximately kT/q, where the charge quantity is q, the Boltzmann''s constant is k and the absolute temperature is T.
Claim 2
Dependent Claim
143 words
A temperature dependent current supply circuit comprising first and second transistors, a source of supply voltage, first and second resistors connected in series to said first transistor across said source of supply voltage, the base of said second transistor being connected to the collector of said first transistor, the base of said first transistor being connected to a point between said first and second resistors, a third resistor connected in series with the emitter of said second transistor to one side of said source of supply voltage and a load connected in series with the collector of said second transistor to the other side of said source, said first and second resistors having values such that the base-collector Voltage of said first transistor is approximately kT/q, where the charge quantity is q, the Boltzmann''s constant is k and the absolute temperature is T.
Claim 3
Dependent Claim
57 words
A temperature dependent current supply circuit as defined in claim 1, wherein the areas of the emitter layers of said first and second transistors are different so as to cause a desired difference between the temperature coefficient of the base-emitter junction of said first transistor and the temperature coefficient of the base-emitter junction of said second transistor.
Claim 4
Dependent Claim
54 words
A temperature dependent current supply circuit as defined in claim 1, wherein said third resistor has a resistance value sufficient to restrict the current flow through the second transistor so as to cause a desired difference between the temperature coefficient of the base-emitter junction of said first transistor and that of said second transistor.
Claim 5
Dependent Claim
213 words
A temperature dependent current supply circuit comprising first and second transistors, a source of supply voltage, first and second resistors connected in series to said first transistor across said source of supply voltage, the base of said second transistor being connected to the collector of said first transistor, the base of said first transistor being connected to a point between said first and second resistors, said first and second resistors having values such that the base-collector voltage of said first transistor is approximately kT/q, where the charge quantity is q, the Boltzmann''s constant is k and the absolute temperature is T, a third transistor and third and fourth resistors connected in series with said second transistor across said source of supply voltage, said third resistor being connected between the emitter of said second transistor and one side of said source of supply voltage, a fourth transistor connected in series with a load and a fifth resistor across said source of supply voltage, the bases of said third and fourth transistors being connected together, and a fifth transistor having its base connected to the collector of said second transistor, its emitter being connected to the bases of said third and fourth transistors and its collector being connected to the emitter of said fourth transistor.
Claim 6
Dependent Claim
213 words
A temperature dependent current supply circuit comprising first and second transistors, a source of supply voltage, first and second resistors connected in series to said first transistor across said source of supply voltage, the base of said second transistor being connected to the collector of said first transistor, the base of said first transistor being connected to a point between said first and second resistors, said first and second resistors having values such that the base-collector voltage of said first transistor is approximately kT/q, where the charge quantity is q, the Boltzmann''s constant is k and the absolute temperature is T, a third transistor and third and fourth resistors connected in series with said second transistor across said source of supply voltage, said third resistor being connected between the emitter of said second transistor and one side of said source of supply voltage, a fourth transistor connected in series with a load and a fifth resistor across said source of supply voltage, the bases of said third and fourth transistors being connected together, and a fifth transistor having its base connected to the collector of said second transistor, its emitter being connected to the bases of said third and fourth transistors and its collector being connected to the emitter of said fourth transistor.
Claim 7
Dependent Claim
29 words
A temperature dependent current supply circuit as defined in claim 4, wherein said third and fourth transistors are each formed as composite transistors comprising interconnected NPN and PNP transistors.
Claim 8
Dependent Claim
54 words
A temperature dependent current supply circuit as defined in claim 4, wherein said third resistor has a resistance value sufficient to restrict the current flow through the second transistor so as to cause a desired difference between the temperature coefficient of the base-emitter junction of said first transistor and that of said second transistor.
Claim 9
Dependent Claim
57 words
A temperature dependent current supply circuit as defined in claim 4, wherein the areas of the emitter layers of said first and second transistors are different so as to cause a desired difference between the temperature coefficient of the base-emitter junction of said first transistor and the temperature coefficient of the base-emitter junction of said second transistor.
Claim 10
Dependent Claim
241 words
A temperature dependent current supply circuit comprising first and second transistors, a source of supply voltage, first and second resistors connected in series to said first transistor across said source of supply voltage, the base of said second transistor being connected to the collector of said first transistor, the base of said first transistor being connected to a point between said first and second resistors, said first and second resistors having values such that the base-collector voltage of said first transistor is approximately kT/q, where the charge quantity is q, the Boltzmann''s constant is k and the absolute temperature is T, a third resistor and third and fourth resistors connected in series with said second transistOr across said source of supply voltage, said third resistor being connected between the emitter of said second transistor and one side of said source of supply voltage, a fourth transistor connected in series with a load and a fifth resistor across said source of supply voltage, the bases of said third and fourth transistors being connected together, fifth and sixth transistors connected together through a sixth resistor in series across said source of supply voltage, a pair of diodes connecting the bases of said third and fourth transistors to a point between said fifth and sixth transistors, the base of said fifth transistor being connected to the base of said second transistor and the base of said sixth transistor being connected to said third transistor.
Claim 11
Dependent Claim
241 words
A temperature dependent current supply circuit comprising first and second transistors, a source of supply voltage, first and second resistors connected in series to said first transistor across said source of supply voltage, the base of said second transistor being connected to the collector of said first transistor, the base of said first transistor being connected to a point between said first and second resistors, said first and second resistors having values such that the base-collector voltage of said first transistor is approximately kT/q, where the charge quantity is q, the Boltzmann''s constant is k and the absolute temperature is T, a third resistor and third and fourth resistors connected in series with said second transistOr across said source of supply voltage, said third resistor being connected between the emitter of said second transistor and one side of said source of supply voltage, a fourth transistor connected in series with a load and a fifth resistor across said source of supply voltage, the bases of said third and fourth transistors being connected together, fifth and sixth transistors connected together through a sixth resistor in series across said source of supply voltage, a pair of diodes connecting the bases of said third and fourth transistors to a point between said fifth and sixth transistors, the base of said fifth transistor being connected to the base of said second transistor and the base of said sixth transistor being connected to said third transistor.
Claim 12
Dependent Claim
29 words
A temperature dependent current supply circuit as defined in claim 8, wherein said third and fourth transistors are each formed as composite transistors comprising interconnected NPN and PNP transistors.
Claim 13
Dependent Claim
54 words
A temperature dependent current supply circuit as defined in claim 8, wherein said third resistor has a resistance value sufficient to restrict the current flow through the second transistor so as to cause a desired difference between the temperature coefficient of the base-emitter junction of said first transistor and that of said second transistor.
Claim 14
Dependent Claim
57 words
A temperature dependent current supply circuit as defined in claim 8, wherein the areas of the emitter layers of said first and second transistors are different so as to cause a desired difference between the temperature coefficient of the base-emitter junction of said first transistor and the temperature coefficient of the base-emitter junction of said second transistor.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |