US3701004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for generating a repeatable voltage as a function of temperature
Assignee: United States Department of the Army
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Filing: 1971-05-13
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Granted: 1972-10-24
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Expires: 1991-05-13
Abstract
Abstract A circuit for producing a repeatable predetermined voltage as a function of temperature and includes a component having a known temperature coefficient characteristic. A transistor stage connected to the component multiplies the temperature coefficient. Linear as well as non-linear temperature characteristics can be multiplied by the circuit.
Inventors
- 👤 Thomas E Tuccinardi
- 👤 Joseph W Miller Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:25
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/01; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/462; G05F1/463; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A circuit for producing a repeatable predetermined voltage as function of temperature comprising a component having a known temperature coefficient characteristic; circuit means connected to the component for multiplying the component temperature coefficient to form a different temperature coefficient characteristic; and connection means for connecting an input voltage to the component, the circuit means including a transistor having its emitter connected to an input voltage, a branch circuit path including said component in addition to means for compensating temperature changes in the emitter-base junction of the transistor, means connecting the branch circuit path between the input voltage and the transistor base, and collector resistance means connected between the transistor collector and a reference potential, whereby the change in voltage across the collector resistance means is the change in the voltage across the component multiplied by the voltage gain of the transistor.
Claim 2
Dependent Claim
141 words
A circuit for producing a repeatable predetermined voltage as function of temperature comprising a component having a known temperature coefficient characteristic; circuit means connected to the component for multiplying the component temperature coefficient to form a different temperature coefficient characteristic; and connection means for connecting an input voltage to the component, the circuit means including a transistor having its emitter connected to an input voltage, a branch circuit path including said component in addition to means for compensating temperature changes in the emitter-base junction of the transistor, means connecting the branch circuit path between the input voltage and the transistor base, and collector resistance means connected between the transistor collector and a reference potential, whereby the change in voltage across the collector resistance means is the change in the voltage across the component multiplied by the voltage gain of the transistor.
Claim 3
Dependent Claim
34 words
The subject matter set forth in claim 1 wherein the connection between the transistor emitter and the input voltage includes a series emitter resistor which serves as a current source for the collector resistor.
Claim 4
Dependent Claim
20 words
The structure set forth in claim 1 wherein the component is A solid state device having a linear temperature coefficient.
Claim 5
Dependent Claim
19 words
The circuitry distinguished in claim 1 wherein the component is a solid state device having a non-linear temperature coefficient.
Claim 6
Dependent Claim
57 words
The subject matter as set forth in claim 2 wherein the base of the transistor is connected to the referenced potential through a base resistor chosen so that the current through said component is at least a factor of 10 greater than the base current of the transistor thereby making negligible the transistor beta change with temperature.
Claim 7
Dependent Claim
42 words
The circuitry as defined in claim 1 wherein output voltage and current are derived at the transistor collector, the circuit being sensitive to output current whereby an increase in output current is accompanied by a commensurate decrease in output voltage, and vice-versa.
Claim 8
Dependent Claim
34 words
The structure set forth in claim 1 wherein a driver stage is coupled between the input voltage terminal and the transistor collector to furnish an output current of increased capacity dependent upon input voltage.
Claim 9
Dependent Claim
30 words
The structure defined in claim 1 wherein a Zener diode is connected in series with the collector resistance means for adding a voltage offset to the temperature varying voltage characteristic.
Claim 10
Dependent Claim
12 words
The circuitry defined in claim 3 wherein the device is a diode.
Claim 11
Dependent Claim
23 words
The circuitry distinguished in claim 1 wherein the component can be any temperature sensitive electrical component if the input voltage is already regulated.
References Cited (Backward Citations)
US2871376A
Cited
US3388344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |