US4137465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-stage integrated injection logic circuit
Assignee: US Philips Corp
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Filing: 1977-06-02
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Granted: 1979-01-30
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Expires: 1997-06-02
Abstract
Abstract A multi-stage I 2 L circuit includes a first switching transistor in a higher stage coupled as a bistable trigger to a second transistor in a lower stage. Additional circuitry is supplied to increase the switching speed of the I 2 L circuit by draining stored charge from the base of the second transistor. Regenerative feedback is employed to enhance the effect.
Inventors
- 👤 Cornelis M. Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:09
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286; H03K3/288
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
370 words
A circuit comprising voltage supply terminals; a plurality of circuit stages connected in series across said voltage supply terminals so as to include a first in the series connected closer to one supply terminal and defined as a higher stage and at least a second in the series connected further from said one terminal and defined as a lower stage, and current injector means in a plurality of said circuit stages for supplying current thereto; said first stage including: a first switching transistor of the first conductivity type having emitter, base, and one or more collectors; a first auxiliary transistor of a second conductivity type having emitter, base, and collector; means connecting a collector of said first switching transistor to the emitter of said first auxiliary transistor, and the base of said first switching transistor to a current injector in said first stage; said second stage including a second switching transistor of the first conductivity type having emitter, base, and one or more collectors; means connecting the collector of said first auxiliary transistor to the base of said second switching transistor for supplying a signal thereto; a third switching transistor of the first conductivity type having emitter, base, and one or more collectors; means connecting a collector of said third switching transistor to the base of said second switching transistor, and the base of said third switching transistor to a collector of said second switching transistor; a second auxiliary transistor of the second conductivity type having emitter, base, and collector; means connecting the collector of said second auxiliary transistor to the base of said third switching transistor and supplying thereto a signal which is the inverse of said signal supplied by said first auxiliary transistor to the second switching transistor; a fourth switching transistor located in a stage higher than said second stage and having emitter, base and a collector; means connecting the collector of said fourth transistor to said second auxiliary transistor for controlling same, and means connecting the base of said fourth switching transistor to a current injector; and the base of the first switching transistor being connectible to a signal input means and a collector of the second switching transistor being connectible to a signal output means.
Claim 2
Dependent Claim
370 words
A circuit comprising voltage supply terminals; a plurality of circuit stages connected in series across said voltage supply terminals so as to include a first in the series connected closer to one supply terminal and defined as a higher stage and at least a second in the series connected further from said one terminal and defined as a lower stage, and current injector means in a plurality of said circuit stages for supplying current thereto; said first stage including: a first switching transistor of the first conductivity type having emitter, base, and one or more collectors; a first auxiliary transistor of a second conductivity type having emitter, base, and collector; means connecting a collector of said first switching transistor to the emitter of said first auxiliary transistor, and the base of said first switching transistor to a current injector in said first stage; said second stage including a second switching transistor of the first conductivity type having emitter, base, and one or more collectors; means connecting the collector of said first auxiliary transistor to the base of said second switching transistor for supplying a signal thereto; a third switching transistor of the first conductivity type having emitter, base, and one or more collectors; means connecting a collector of said third switching transistor to the base of said second switching transistor, and the base of said third switching transistor to a collector of said second switching transistor; a second auxiliary transistor of the second conductivity type having emitter, base, and collector; means connecting the collector of said second auxiliary transistor to the base of said third switching transistor and supplying thereto a signal which is the inverse of said signal supplied by said first auxiliary transistor to the second switching transistor; a fourth switching transistor located in a stage higher than said second stage and having emitter, base and a collector; means connecting the collector of said fourth transistor to said second auxiliary transistor for controlling same, and means connecting the base of said fourth switching transistor to a current injector; and the base of the first switching transistor being connectible to a signal input means and a collector of the second switching transistor being connectible to a signal output means.
Claim 3
Dependent Claim
24 words
A circuit as defined in claim 1 wherein the base of said fourth transistor is connected to a collector of said first switching transistor.
Claim 4
Dependent Claim
295 words
A circuit comprising voltage supply terminals; a plurality of circuit stages connected in series across said voltage supply terminals so as to include a first in the series connected closer to one supply terminal and defined as a higher stage and at least a second in the series connected further from said one terminal and defined as a lower stage, and current injector means in a plurality of said circuit stages for supplying current thereto; said first stage including: a first switching transistor of the first conductivity type having emitter, base, and one or more collectors; a first auxiliary transistor of a second conductivity type having emitter, base, and collector; means connecting a collector of said first switching transistor to the emitter of said first auxiliary transistor, and the base of said first switching transistor to a current injector in said first stage; said second stage including a second switching transistor of the first conductivity type having emitter, base, and one or more collectors; a signal input connected to the base of said first switching transistor; means connecting the collector of said first auxiliary transistor to the base of said second switching transistor for supplying a signal thereto; a third switching transistor of the first conductivity type having emitter, base, and one or more collectors; means connecting a collector of said third switching transistor to the base of said second switching transistor; regenerative feedback interconnects the collector of the second and the base of the third switching transistors, and means connected to the base of said third switching transistor for supplying thereto a signal which is the inverse of said signal supplied by said first auxiliary transistor to the second switching transistor; and a signal output connected to a collector of said second switching transistor.
Claim 5
Dependent Claim
295 words
A circuit comprising voltage supply terminals; a plurality of circuit stages connected in series across said voltage supply terminals so as to include a first in the series connected closer to one supply terminal and defined as a higher stage and at least a second in the series connected further from said one terminal and defined as a lower stage, and current injector means in a plurality of said circuit stages for supplying current thereto; said first stage including: a first switching transistor of the first conductivity type having emitter, base, and one or more collectors; a first auxiliary transistor of a second conductivity type having emitter, base, and collector; means connecting a collector of said first switching transistor to the emitter of said first auxiliary transistor, and the base of said first switching transistor to a current injector in said first stage; said second stage including a second switching transistor of the first conductivity type having emitter, base, and one or more collectors; a signal input connected to the base of said first switching transistor; means connecting the collector of said first auxiliary transistor to the base of said second switching transistor for supplying a signal thereto; a third switching transistor of the first conductivity type having emitter, base, and one or more collectors; means connecting a collector of said third switching transistor to the base of said second switching transistor; regenerative feedback interconnects the collector of the second and the base of the third switching transistors, and means connected to the base of said third switching transistor for supplying thereto a signal which is the inverse of said signal supplied by said first auxiliary transistor to the second switching transistor; and a signal output connected to a collector of said second switching transistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |