US4362984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit to correct non-linear terms in bandgap voltage references
Assignee: Texas Instruments Inc
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Filing: 1981-03-16
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Granted: 1982-12-07
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Expires: 2001-03-16
Abstract
Abstract A circuit and a method of operation thereof are disclosed to compensate for second order non-linearities in bandgap voltage references. The circuit is readily fabricated as an integrated circuit in conjunction with circuitry utilized to correct linear variations. The circuit accurately compensates for the non-linear bow effect over a temperature range of -55° C. to +150° C.
Inventors
- 👤 Varnum S. Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:56
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30; G05F3/22; G05F3/222; G05F3/225; Y; Y10; Y10S; Y10S323/00; Y10S323/907
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A circuit which compensates for non-linear temperature induced variation in a voltage reference comprising: a. means for directing first and second current to flow through first and second circuit means, respectively; b. means for maintaining said first and second currents at a substantially similar magnitude; c. means for directing a component of said first current to flow through a third circuit means; and d. means for controlling said third circuit means including fourth circuit means operable to increase or decrease the value of said current component as a function of temperature.
Claim 2
Dependent Claim
91 words
A circuit which compensates for non-linear temperature induced variation in a voltage reference comprising: a. means for directing first and second current to flow through first and second circuit means, respectively; b. means for maintaining said first and second currents at a substantially similar magnitude; c. means for directing a component of said first current to flow through a third circuit means; and d. means for controlling said third circuit means including fourth circuit means operable to increase or decrease the value of said current component as a function of temperature.
Claim 3
Dependent Claim
34 words
A circuit as in claim 1 wherein said first and second circuit means comprise a linear temperature variation compensation structure, and said third and fourth circuit means comprise a non-linear temperature variation compensation structure.
Claim 4
Dependent Claim
20 words
A circuit as in claim 2 wherein all of the above stated circuit means are integrated upon a single substrate.
Claim 5
Independent Claim
86 words
A method for compensating for non-linear temperature induced variation in a voltage reference comprising the steps of: a. directing first and second currents to flow through first and second circuit means, respectively; b. maintaining said first and second currents at a substantially similar magnitude; c. directing a component of said first current to flow through a third circuit means; and d. controlling said third circuit means with a fourth circuit means operable to increase or decrease the value of said current as a function of temperature.
Claim 6
Independent Claim
86 words
A method for compensating for non-linear temperature induced variation in a voltage reference comprising the steps of: a. directing first and second currents to flow through first and second circuit means, respectively; b. maintaining said first and second currents at a substantially similar magnitude; c. directing a component of said first current to flow through a third circuit means; and d. controlling said third circuit means with a fourth circuit means operable to increase or decrease the value of said current as a function of temperature.
Claim 7
Dependent Claim
43 words
A method as in claim 4 wherein the steps of directing and maintaing said first and second currents are operable to compensate for linear temperature variations and the steps of directing a component and controlling are operable to compensate for non-linear temperature variations.
Claim 8
Dependent Claim
21 words
A method as in claim 5 further including the step of integrating all of said circuit means upon a single substrate.
Claim 9
Dependent Claim
58 words
A voltage reference circuit wherein first circuit means are coupled to an input current means, said first circuit means operable to produce a voltage output compensated with respect to temperature induced linear variation, said voltage reference circuit characterized in that a second circuit means is included to compensate said voltage output with respect to temperature induced non-linear variation.
Claim 10
Dependent Claim
58 words
A voltage reference circuit wherein first circuit means are coupled to an input current means, said first circuit means operable to produce a voltage output compensated with respect to temperature induced linear variation, said voltage reference circuit characterized in that a second circuit means is included to compensate said voltage output with respect to temperature induced non-linear variation.
References Cited (Backward Citations)
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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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |