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Patent US3648153A successfully refreshed from Google Patents.
US3648153A
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Reference voltage source
Assignee: RCA Corp
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Filing: 1970-11-04
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Granted: 1972-03-07
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Expires: 1990-11-04
Abstract
Abstract A temperature compensated reference voltage source is provided which is suitable for fabrication using integrated circuit techniques. A constant current source is coupled via first and second current paths to a reference terminal. Each of the first and second current paths includes one or more diodes. A current repeater circuit, which includes a further diode and a transistor having proportionally related conduction characteristics, is coupled between the two current paths and the reference terminal to provide substantially constant currents in each of the first and second paths. The currents are selected so that a difference voltage, produced across the emitter-collector electrodes of the transistor of the repeater circuit, is substantially constant as a function of temperature.
Inventors
- 👤 Stefano Arturo Graf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:36
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22; G05F3/222; G05F3/225; Y; Y10; Y10S; Y10S323/00; Y10S323/907
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
A reference voltage source comprising: a substantially constant current source, first and second current paths each including a plurality of semiconductor rectifier devices connected in series relation to said source, said rectifier devices being poled in a forward bias direction with respect to said source, means including a further semiconductor rectifier device coupling said first current path to a reference terminal for providing a first voltage between said current source and said reference terminal equal to the sum of forward bias voltages across said rectifier devices in said first path and a transistor having base and emitter electrodes connected across said further device and an emitter-collector circuit coupling said second current path to said reference terminal for providing a second voltage between said current source and said collector equal to the sum of forward bias voltages across said rectifier devices in said second path, said transistor and further device having proportionally related conduction characteristics for establishing substantially constant, proportionally related currents through said first and second paths at levels so as to produce, between Said collector and said reference terminal, a temperature stabilized reference voltage equal to the difference between said first and second voltages.
Claim 2
Dependent Claim
195 words
A reference voltage source comprising: a substantially constant current source, first and second current paths each including a plurality of semiconductor rectifier devices connected in series relation to said source, said rectifier devices being poled in a forward bias direction with respect to said source, means including a further semiconductor rectifier device coupling said first current path to a reference terminal for providing a first voltage between said current source and said reference terminal equal to the sum of forward bias voltages across said rectifier devices in said first path and a transistor having base and emitter electrodes connected across said further device and an emitter-collector circuit coupling said second current path to said reference terminal for providing a second voltage between said current source and said collector equal to the sum of forward bias voltages across said rectifier devices in said second path, said transistor and further device having proportionally related conduction characteristics for establishing substantially constant, proportionally related currents through said first and second paths at levels so as to produce, between Said collector and said reference terminal, a temperature stabilized reference voltage equal to the difference between said first and second voltages.
Claim 3
Dependent Claim
60 words
A reference voltage source according to claim 1 wherein: said first and second currents are selected such that the summation of changes in voltage as a function of temperature of said rectifier devices in said first path is substantially equal to the summation of changes in voltage as a function of temperature of said rectifier devices in said second path.
Claim 4
Dependent Claim
24 words
A reference voltage source according to claim 2 wherein: said current source is arranged to provide said constant current substantially independent of operating temperature.
Claim 5
Dependent Claim
34 words
A reference voltage source according to claim 2 wherein: the number of rectifier devices in said first path, including said further device, is greater than the number of rectifier devices in said second path.
Claim 6
Dependent Claim
51 words
A reference voltage source according to claim 2 wherein: all of said rectifier devices are fabricated of like material, said reference voltage is substantially equal to n times the band gap voltage for said material, where n is the difference between the number of devices in said first and second paths.
Claim 7
Dependent Claim
64 words
A reference voltage source according to claim 5 and further comprising: a second transistor having base and emitter electrodes coupled across one of said rectifier devices of said second path and having proportionally related conduction characteristics with respect to said one device, and a collector electrode connected to another of said rectifier devices in said second path for diverting current from said second path.
Claim 8
Dependent Claim
53 words
A reference voltage source according to claim 6 wherein: said transistor and further rectifier device are fabricated as transistors of one type conductivity and said second transistor and remaining rectifier devices are fabricated as like transistors of opposite type conductivity, each said rectifier device having a collector electrode shorted to a base electrode.
Claim 9
Dependent Claim
34 words
A reference voltage source according to claim 2 wherein: said transistor and said further device are related such that collector current of said transistor is a predetermined fraction of current in said further device.
Claim 10
Dependent Claim
29 words
A reference voltage source according to claim 8 wherein: said reference terminal is connected to ground potential, and said current source is coupled to a source of operating potential.
Claim 11
Dependent Claim
30 words
A reference voltage source according to claim 9 and further comprising: means for coupling said current source to said collector electrode to provide a temperature stabilized current from said source.
References Cited (Backward Citations)
US3522521A
Cited
US3534245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |