US4490670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage generator
Assignee: Advanced Micro Devices Inc
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Filing: 1982-10-25
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Granted: 1984-12-25
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Expires: 2002-10-25
Abstract
Abstract A reference voltage generator including a circuit for generating a reference voltage V REF having a non-linear voltage-temperature function, in which the improvement comprises an additional resistor being in circuit to make the function linear. By making the function linear, the equation defining V REF is easily differentiated to determine the change in voltage with temperature.
Inventors
- 👤 Thomas H. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:22
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30; Y; Y10; Y10S; Y10S323/00; Y10S323/907
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
214 words
In an apparatus having means for generating a reference voltage V REF , in which the reference voltage V REF is changeable non-linearly with temperature, the improvement comprising: means for making the reference voltage V REF changeable linearly with temperature, wherein said means for generating includes: a voltage input; a first circuit path, having a series-connected resistor R 1 and transistor Q 1 , connected between said voltage input and ground; a second circuit path, having a series-connected resistor R 2 , transistor Q 2 and resistor R 3 , connected between said voltage input and ground; a third circuit path having a transistor Q 3 connected between said voltage input and ground, said transistor Q 3 having a base connected between said resistor R 2 and the collector of said transistor Q 2 ; and a resistor R 4 connected between said base of said transistor Q 3 and ground; and wherein said means for making provides the following equation: ##EQU14## T=temperature, k=Boltzmann's constant, q=charge of an electron, and where R 1 , R 2 , R 4 and R 5 are chosen such that ##EQU15## so that ##EQU16## and wherein said means for making comprises a resistor R 5 being connected to eliminate V REF on the right side of said equation.
Claim 2
Dependent Claim
214 words
In an apparatus having means for generating a reference voltage V REF , in which the reference voltage V REF is changeable non-linearly with temperature, the improvement comprising: means for making the reference voltage V REF changeable linearly with temperature, wherein said means for generating includes: a voltage input; a first circuit path, having a series-connected resistor R 1 and transistor Q 1 , connected between said voltage input and ground; a second circuit path, having a series-connected resistor R 2 , transistor Q 2 and resistor R 3 , connected between said voltage input and ground; a third circuit path having a transistor Q 3 connected between said voltage input and ground, said transistor Q 3 having a base connected between said resistor R 2 and the collector of said transistor Q 2 ; and a resistor R 4 connected between said base of said transistor Q 3 and ground; and wherein said means for making provides the following equation: ##EQU14## T=temperature, k=Boltzmann's constant, q=charge of an electron, and where R 1 , R 2 , R 4 and R 5 are chosen such that ##EQU15## so that ##EQU16## and wherein said means for making comprises a resistor R 5 being connected to eliminate V REF on the right side of said equation.
Claim 3
Dependent Claim
41 words
Apparatus, according to claim 1, wherein the base of said first transistor Q 1 and the base of said second transistor Q 2 are connected in common between said resistor R 1 and the collector of said transistor Q 1 .
Claim 4
Dependent Claim
217 words
An apparatus in claim 1 wherein said means for generating a reference voltage V REF further includes: (a) a voltage input; (b) a first circuit path having said resistor R 1 having one end coupled to said voltage input and a transistor Q 1 having its base and collector coupled to the other end of said resistor R 1 and its emitter coupled to ground; (c) a second circuit path having said resistor R 2 having one end coupled to said voltage input, a transistor Q 2 having its collector connected to the other end of resistor R 2 , its base connected to the other end of resistor R 1 and an emitter, and said resistor R 3 having one end connected to the emitter of said transistor Q 2 and the other end connected to ground; (d) a third circuit path having said transistor Q 3 having its collector coupled to said voltage input, its emitter coupled to ground and its base connected to the other end of said resistor R 2 ; (e) said resistor R 4 connected between said base of said transistor Q 3 and ground; and (f) said resistor R 5 connected between the other end of said resistor R 1 and the collector of said transistor Q 1 and ground.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |