Patent US4002964A successfully refreshed from Google Patents.
US4002964A
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Temperature compensation technique
Assignee: Gordon Engineering Co
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Filing: 1975-10-02
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Granted: 1977-01-11
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Expires: 1995-10-02
Abstract
Abstract A temperature compensation system and technique requiring no measurement of actual temperature differential and wherein each source of thermal error in an electronic circuit can be corrected in addition to overall thermal error. Two reference voltages are provided having equal and opposite temperature response and having a null value at selected normal temperature. A respective correcting voltage is derived from the two reference voltages for each source of thermal error and each of magnitude and polarity to compensate for the corresponding thermal error. A correcting voltage can also be derived for compensation of overall residual thermal error.
Inventors
- 👤 Bernard M. Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:01
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/567
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
For use in apparatus in which electrical response is a function of temperature, a temperature compensation system comprising: first means having a positive temperature characteristic for providing a first reference voltage positively increasing with temperature; second means having a negative temperature characteristic equal and opposite to that of said first means for providing a second reference voltage negatively increasing with temperature; said first and second reference voltages having a null value at a predetermined reference temperature; and means for deriving at least one correction voltage from both said first and second reference voltages of a magnitude and sense to correct for particular temperature error.
Claim 2
Dependent Claim
104 words
For use in apparatus in which electrical response is a function of temperature, a temperature compensation system comprising: first means having a positive temperature characteristic for providing a first reference voltage positively increasing with temperature; second means having a negative temperature characteristic equal and opposite to that of said first means for providing a second reference voltage negatively increasing with temperature; said first and second reference voltages having a null value at a predetermined reference temperature; and means for deriving at least one correction voltage from both said first and second reference voltages of a magnitude and sense to correct for particular temperature error.
Claim 3
Dependent Claim
42 words
The invention according to claim 1 wherein said last named means includes a plurality of means for deriving respective correction voltages from both said first and second reference voltages, each of a magnitude and sense to correct for a corresponding temperature error.
Claim 4
Dependent Claim
135 words
A temperature compensation system comprising: temperature sensing means providing an output signal representative of operating temperature; amplifier means operative in response to the output signal of said temperature sensing means to provide a first reference voltage of substantially linear form positively increasing with temperature; inverter means coupled to said amplifier means for providing a second reference voltage of substantially linear form negatively increasing with temperature and of equal and opposite temperature characteristic to that of said first reference signal; means for adjusting said output signal to provide a null value of said first and second reference voltages at a predetermined reference temperature; and at least one potentiometer means for deriving at least one correction voltage from both said first and second reference voltages of a magnitude and sense to correct for a corresponding temperature error.
Claim 5
Dependent Claim
135 words
A temperature compensation system comprising: temperature sensing means providing an output signal representative of operating temperature; amplifier means operative in response to the output signal of said temperature sensing means to provide a first reference voltage of substantially linear form positively increasing with temperature; inverter means coupled to said amplifier means for providing a second reference voltage of substantially linear form negatively increasing with temperature and of equal and opposite temperature characteristic to that of said first reference signal; means for adjusting said output signal to provide a null value of said first and second reference voltages at a predetermined reference temperature; and at least one potentiometer means for deriving at least one correction voltage from both said first and second reference voltages of a magnitude and sense to correct for a corresponding temperature error.
Claim 6
Dependent Claim
24 words
The invention according to claim 3 wherein said temperature sensing means includes: a bridge circuit having a thermally sensitive element in one arm thereof.
Claim 7
Dependent Claim
41 words
The invention according to claim 3 wherein said potentiometer means includes: a plurality of potentiometers for deriving respective correction voltages from both said first and second reference voltages each of a magnitude and sense to correct for a corresponding temperature error.
Claim 8
Dependent Claim
31 words
The invention according to claim 5 further including: means for connecting each of said potentiometers to a respective point of an operating circuit at which temperature compensation is to be provided.
Claim 9
Independent Claim
94 words
A method of temperature compensation comprising the steps of: sensing an operating temperature; producing a first reference signal positively increasing with temperature and having a predetermined null value at a selected reference temperature; producing a second reference signal negatively increasing with temperature and of equal and opposite temperature characteristic to that of said first reference signal and having the same predetermined null value at said selected reference temperature; and deriving from said first and second reference signals at least one correction signal of a magnitude and sense to correct for a corresponding temperature error.
Claim 10
Independent Claim
94 words
A method of temperature compensation comprising the steps of: sensing an operating temperature; producing a first reference signal positively increasing with temperature and having a predetermined null value at a selected reference temperature; producing a second reference signal negatively increasing with temperature and of equal and opposite temperature characteristic to that of said first reference signal and having the same predetermined null value at said selected reference temperature; and deriving from said first and second reference signals at least one correction signal of a magnitude and sense to correct for a corresponding temperature error.
Claim 11
Dependent Claim
23 words
The invention according to claim 7 wherein said first and second reference signals are of substantially linear form over an intended operating range.
Claim 12
Dependent Claim
34 words
The invention according to claim 7 further including the step of: applying said at least one correction signal to a predetermined point of an associated circuit at which temperature compensation is to be provided.
References Cited (Backward Citations)
US3293540A
Cited
US3488529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |