US4785230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature and power supply independent voltage reference for integrated circuits
Assignee: Texas Instruments Inc
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Filing: 1987-04-24
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Granted: 1988-11-15
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Expires: 2007-04-24
Abstract
Abstract A voltage reference circuit which includes a first diode having a first predetermined forward voltage drop as a function of current, a second diode having a second predetermined forward voltage drop as a function of current, lower by a preselected amount than said first diode voltage drop and connected to a voltage reference node and to one end of said first diode. A resistor is connected to the voltage reference node and to another end of the first diode such that the second diode and the resistor form a current path around the first diode. The arrangement is such that the temperature coefficient of voltage at the voltage reference node is less than that across the first diode.
Inventors
- 👤 Kevin M. Ovens
- 👤 John D. Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:12
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
112 words
A voltage reference circuit, comprising: a first diode having a first predetermined forward voltage drop as a function of current; a second diode having a second predetermined forward voltage drop as a function of current, lower by a preselected amount than said first diode voltage drop and connected to a compensated node and to one end of said first diode; and a resistive element connected to said compensated node and to another end of said first diode such that said second diode and said resistive element form a current path around said first diode; wherein the temperature coefficient of voltage at said compensated node is less than that across said first diode.
Claim 2
Dependent Claim
112 words
A voltage reference circuit, comprising: a first diode having a first predetermined forward voltage drop as a function of current; a second diode having a second predetermined forward voltage drop as a function of current, lower by a preselected amount than said first diode voltage drop and connected to a compensated node and to one end of said first diode; and a resistive element connected to said compensated node and to another end of said first diode such that said second diode and said resistive element form a current path around said first diode; wherein the temperature coefficient of voltage at said compensated node is less than that across said first diode.
Claim 3
Dependent Claim
16 words
A circuit according to claim 1, including a current source in series with said first diode.
Claim 4
Dependent Claim
19 words
A circuit according to claim 2, wherein said first and second diodes are Schottky diodes of different metal types.
Claim 5
Dependent Claim
24 words
A circuit according to claim 3, wherein said first diode is platinum silicide on silicon and said second diode is titanium tungsten on silicon.
Claim 6
Dependent Claim
19 words
A circuit according to claim 2, wherein the temperature coefficients of voltage of said first and second diodes overlap.
Claim 7
Dependent Claim
17 words
A circuit according to claim 2, wherein said resistive element is a plurality of series connected resistors.
Claim 8
Dependent Claim
13 words
A circuit according to claim 1, wherein said resistive element is a resistor.
Claim 9
Dependent Claim
136 words
A voltage reference circuit formed on a face of a semiconductor body, comprising: a first Schottky diode having a first predetermined forward voltage drop as a function of current; a current source in series with said first diode; a second Schottky diode having a second predetermined forward voltage drop as a function of current lower by a preselected amount than said first diode voltage drop and connected to a voltage reference node and to one end of said first diode; resistive means connected to said compensated node and to another end of said first diode such that said second diode and said resistive means form a current path around said first diode; and wherein the difference in the temperature coefficient of voltage of said first and second diodes is less than that of said first diode.
Claim 10
Dependent Claim
136 words
A voltage reference circuit formed on a face of a semiconductor body, comprising: a first Schottky diode having a first predetermined forward voltage drop as a function of current; a current source in series with said first diode; a second Schottky diode having a second predetermined forward voltage drop as a function of current lower by a preselected amount than said first diode voltage drop and connected to a voltage reference node and to one end of said first diode; resistive means connected to said compensated node and to another end of said first diode such that said second diode and said resistive means form a current path around said first diode; and wherein the difference in the temperature coefficient of voltage of said first and second diodes is less than that of said first diode.
Claim 11
Dependent Claim
19 words
A circuit according to claim 8, wherein the anodes of said diodes are both connected to said current source.
Claim 12
Dependent Claim
24 words
A circuit according to claim 9, wherein said first diode is platinum silicide on silicon and said second diode is titanium tungsten on silicon.
Claim 13
Dependent Claim
19 words
A circuit according to claim 8, wherein the cathodes of said diodes are both connected to said current source.
Claim 14
Dependent Claim
24 words
A circuit according to claim 11, wherein said first diode is platinum silicide on silicon and said second diode is titanium tungsten on silicon.
Claim 15
Dependent Claim
13 words
A circuit according to claim 8, wherein said resistive means is a resistor.
Claim 16
Dependent Claim
17 words
A circuit according to claim 8, wherein said resistive means is a plurality of series connected resistors.
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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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |