US3604956A
Expired / Lapsed
US
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Radiation immune timing circuit
Assignee: United States Department of the Navy
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Filing: 1969-07-01
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Granted: 1971-09-14
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Expires: 1989-07-01
Abstract
Abstract An interval-timing circuit which remains accurate after being subjected to a transient radiation impulse. The circuit includes a bucket and ladle integrating network for converting digital timing pulses to an analog voltage signal. The analog voltage signal is converted to a current signal by an isolation circuit and is then passed to a current level detector which generates an output when the current signal reaches a predetermined magnitude. A dynamic resetting circuit is coupled to the current level detector to prevent the generation of a premature response due to false activation of the level detector by a transient radiation impulse.
Inventors
- 👤 Walter A Cooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:29
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
188 words
A radiation immune circuit comprising: input means for converting digital input voltage pulses into an analog voltage corresponding to the number of said digital input voltage pulses; isolation means coupled to said input means and having a high input impedance for converting said analog voltage to an analog current without affecting the information content thereof; level-detecting means coupled to said isolation means for normally receiving said analog current and for generating a first output voltage whenever the received analog current exceeds a selected amplitude, corresponding to the receipt by said input means of a predetermined number of digital input voltage pulses; inhibiting means coupled to said isolation means for selectively preventing said analog current from reaching said level detecting means, thereby preventing said level-detecting means from generating said first output voltage; resetting means coupled to said level detecting means for preventing said level detecting means from generating said first output voltage when the amplitude of said received analog current is less than said selected amplitude; and output means coupled to said level-detecting means for receiving said first output voltage and for generating an output signal in response thereto.
Claim 2
Dependent Claim
188 words
A radiation immune circuit comprising: input means for converting digital input voltage pulses into an analog voltage corresponding to the number of said digital input voltage pulses; isolation means coupled to said input means and having a high input impedance for converting said analog voltage to an analog current without affecting the information content thereof; level-detecting means coupled to said isolation means for normally receiving said analog current and for generating a first output voltage whenever the received analog current exceeds a selected amplitude, corresponding to the receipt by said input means of a predetermined number of digital input voltage pulses; inhibiting means coupled to said isolation means for selectively preventing said analog current from reaching said level detecting means, thereby preventing said level-detecting means from generating said first output voltage; resetting means coupled to said level detecting means for preventing said level detecting means from generating said first output voltage when the amplitude of said received analog current is less than said selected amplitude; and output means coupled to said level-detecting means for receiving said first output voltage and for generating an output signal in response thereto.
Claim 3
Dependent Claim
66 words
The radiation immune circuit of claim 1, wherein said input means includes first and second energy storage means and an electronic switch controlled by said digital input voltage pulses to briefly store increments of energy on said first energy storage means and to subsequently transfer said increments of energy from said first energy storage means to said second energy storage means for relatively long term storage.
Claim 4
Dependent Claim
51 words
The radiation immune circuit of claim 1, wherein said isolation means comprises: an electronic switch controlled by said input means for passing said analog current in response to said analog voltage; and amplifying means coupled in feedback relationship to said electronic switch for amplifying the current gain of said electronic switch.
Claim 5
Dependent Claim
41 words
The radiation immune circuit of claim 1, wherein said level-detecting means includes: a bistable element for generating said first output voltage whenever said received analog current exceeds said selected amplitude; and means for regulating the amplitude of said received analog current.
Claim 6
Dependent Claim
50 words
The radiation immune circuit of claim 1 wherein said inhibiting means includes a normally nonconductive electronic switch connected to a plurality of input terminals which are connected in an AND gate configuration whereby said electronic switch is rendered conductive when appropriate signals are applied to said plurality of input terminals.
Claim 7
Dependent Claim
52 words
The radiation immune circuit of claim 1 wherein said resetting-means includes electronic switch means alternatively switched from its conductive to its nonconductive state by said digital input voltage pulses whereby a negative resetting potential is applied to said level-detecting means each time said electronic switch means is switched to its conductive state.
Claim 8
Dependent Claim
53 words
The radiation immune circuit of claim 1 wherein said output means includes first normally nonconductive electronic switch means and second normally conductive electronic switch means connected to said first switch means and responsive to the condition thereof whereby said second electronic switch means generates said output signal when switched to its nonconductive state.
Claim 9
Dependent Claim
22 words
The radiation immune circuit of claim 1 further including means for generating a signal of a reverse polarity to said output signal.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |