US3679963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutron radiation and gamma ray hardened adjustable power supply
Assignee: Motorola Solutions Inc
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Filing: 1970-01-30
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Granted: 1972-07-25
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Expires: 1990-01-30
Abstract
Abstract A current supply including matched transistors and diodes in which circulating paths are provided for the increased base currents due to decrease of beta of the transistors caused by neutron radiation and for the photoelectric currents produced in the transistors and diodes due to gamma ray radiation. The flow of current provided by the radiation and gamma hardened current source is adjustable.
Inventors
- 👤 Maurice G Free
- 👤 Leo L Wisseman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:35
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/26; G05F3/265; G05F3/18; G05F3/22; G05F3/222; H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A neutron hardened current source comprising: a first and a second and a third transistor, said transistors being matched and each having a pair of main electrodes and a control electrode, an impedance, means for connecting the main electrodes of said first transistor in series between a ground bus and a voltage bus in series with said impedance, means for connecting said second transistor as a diode having an anode and a cathode electrodes, means for connecting said diode and the main electrodes of said third transistor across said buses, means for connecting the control electrode of said first transistor to an electrode of said diode, and means for connecting the control electrode of said third transistor to the junction of a main electrode of said impedance and said first transistor, whereby current flow of said third transistor is substantially independent of neutron irradiation.
Claim 2
Dependent Claim
144 words
A neutron hardened current source comprising: a first and a second and a third transistor, said transistors being matched and each having a pair of main electrodes and a control electrode, an impedance, means for connecting the main electrodes of said first transistor in series between a ground bus and a voltage bus in series with said impedance, means for connecting said second transistor as a diode having an anode and a cathode electrodes, means for connecting said diode and the main electrodes of said third transistor across said buses, means for connecting the control electrode of said first transistor to an electrode of said diode, and means for connecting the control electrode of said third transistor to the junction of a main electrode of said impedance and said first transistor, whereby current flow of said third transistor is substantially independent of neutron irradiation.
Claim 3
Dependent Claim
44 words
The invention of claim 1 in which a second and a third diode are provided, said second and third diodes being connected in series with the main electrodes of said first transistor between said buses, said diodes being oppositely poled in said series connection.
Claim 4
Dependent Claim
16 words
The invention of claim 1 in which a constant voltage source is connected between said buses.
Claim 5
Dependent Claim
55 words
The invention of claim 1 in which said voltage bus is at negative potential with respect to ground, said transistors being of the same type, the emitters of said first and second transistors being connected to one of said buses and the collector of said third transistor being connected to the other of said buses.
Claim 6
Dependent Claim
122 words
The invention of claim 1 in which fourth, fifth, and sixth transistors are provided all the having a pair of main electrodes and a control electrode, main electrodes of said fourth transistor being connected between a main electrode of said third transistor and one of said buses, the base of said fourth transistor being connected to the anode of a diode connected fifth transistor and also to a main electrode of said sixth transistor, the control electrode of said sixth transistor being connected to the connection between said third and fourth transistors, the other main electrode of said sixth transistor being connected by way of load to a bus and the cathode of said fifth transistor being connected to the other bus.
Claim 7
Dependent Claim
103 words
The invention of claim 5 in which a seventh, eighth and ninth transistor is provided each having a pair of main electrodes and a control electrode, said seventh transistor being connected as a diode, said diode and the main electrodes of said eighth transistor being connected in series with a load between said buses, the control electrodes of said sixth and eighth transistors being connected together, the main electrodes of said ninth transistor being connected between a bus and the control electrode of said eighth transistor and the control electrode of said ninth transistor being connected to the anode of said seventh transistor.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |