US4192013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety circuits for coupling laddics in cascade
Assignee: Ricardo AEA Ltd
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Filing: 1978-06-01
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Granted: 1980-03-04
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Expires: 1998-06-01
Abstract
Abstract A coupling arrangement for coupling laddics in cascade comprises an emitter follower transistor circuit arranged so that the output impedance of the transistor restricts the rise and fall times in the mmf of the laddic output winding. The effect is to reduce the risk of spurious reset signals being generated in the output winding of sufficient amplitude to reset the next laddic in the cascade.
Inventors
- 👤 Albert B. Keats
- 👤 Dudley W. Leggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:27
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
An electric circuit comprising a first laddic component, a second laddic component, and a coupling circuit connecting together the first and the second laddic components in cascade, wherein the improvement comprises, (a) a transistor connected as an emitter follower; (b) an output winding of the first laddic component extending across an end leg of said first laddic component and a leg adjacent said end leg, said output winding having one end thereof connected to the base of said transistor and the other end thereof grounded, and (c) a reset winding of the second laddic component, said reset winding having one end connected to the emitter of said transistor and the other end thereof grounded such that when the magnetic flux in the first laddic component falls from saturation of remanence, reset noise in the coupling circuit is substantially reduced.
Claim 2
Dependent Claim
139 words
An electric circuit comprising a first laddic component, a second laddic component, and a coupling circuit connecting together the first and the second laddic components in cascade, wherein the improvement comprises, (a) a transistor connected as an emitter follower; (b) an output winding of the first laddic component extending across an end leg of said first laddic component and a leg adjacent said end leg, said output winding having one end thereof connected to the base of said transistor and the other end thereof grounded, and (c) a reset winding of the second laddic component, said reset winding having one end connected to the emitter of said transistor and the other end thereof grounded such that when the magnetic flux in the first laddic component falls from saturation of remanence, reset noise in the coupling circuit is substantially reduced.
Claim 3
Dependent Claim
109 words
An electric circuit comprising a first laddic component, a second laddic component, and a coupling circuit for coupling the first and the second laddic components in cascade and including an emitter follower transistor, an output winding of the first laddic component which extends across an end leg of said first laddic component and a leg adjacent said end leg and is connected to the base of said transistor, and a reset winding of the second laddic component connected to the emitter of said transistor such that when the magnetic flux in the first laddic component falls from saturation to remanence reset noise in the coupling circuit is substantially reduced.
Claim 4
Dependent Claim
109 words
An electric circuit comprising a first laddic component, a second laddic component, and a coupling circuit for coupling the first and the second laddic components in cascade and including an emitter follower transistor, an output winding of the first laddic component which extends across an end leg of said first laddic component and a leg adjacent said end leg and is connected to the base of said transistor, and a reset winding of the second laddic component connected to the emitter of said transistor such that when the magnetic flux in the first laddic component falls from saturation to remanence reset noise in the coupling circuit is substantially reduced.
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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |