Patent US3825624A successfully refreshed from Google Patents.
Patent US3693032A successfully refreshed from Google Patents.
US3693032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antisaturation technique for ttl circuits
Assignee: International Business Machines Corp
•
Filing: 1971-04-23
•
Granted: 1972-09-19
•
Expires: 1991-04-23
Abstract
Abstract This specification discloses a technique of saturation control for a transistor transistor logic (TTL) circuit. The saturation control device includes an additional emitter of the input transistor which is connected to the collector of the output transistor.
Inventors
- 👤 James R Winnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:04
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/08; H03K19/082; H03K19/088
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
201 words
A transistor circuit which does not go into saturation, comprising: a driven transistor arranged in common emitter configuration so that the base of the transistor receives drive current and an output for the circuit is taken off the collector for the driven transistor; a multi-emitter transistor with the collector connected to the base of the driven transistor and emitters serving as individual inputs for the circuit; a current source coupled to the base of the multi-emitter transistor so that when any of the emitters serving as inputs are biased down current from the current source does not reach the base of the driven transistor and when all of the collectors are biased up current from the current source is supplied to the base of the driven transistor; and an additional emitter on said multi-emitter transistor which is coupled to the collector of the driven transistor so that said additional emitter becomes forward biased when the collector of the driven transistor drops sufficiently and which is resistively separated from the output of the circuit so that the output of the circuit is lower in potential than the potential at the additional emitter whereby the driven transistor is prevented from going into saturation.
Claim 2
Dependent Claim
201 words
A transistor circuit which does not go into saturation, comprising: a driven transistor arranged in common emitter configuration so that the base of the transistor receives drive current and an output for the circuit is taken off the collector for the driven transistor; a multi-emitter transistor with the collector connected to the base of the driven transistor and emitters serving as individual inputs for the circuit; a current source coupled to the base of the multi-emitter transistor so that when any of the emitters serving as inputs are biased down current from the current source does not reach the base of the driven transistor and when all of the collectors are biased up current from the current source is supplied to the base of the driven transistor; and an additional emitter on said multi-emitter transistor which is coupled to the collector of the driven transistor so that said additional emitter becomes forward biased when the collector of the driven transistor drops sufficiently and which is resistively separated from the output of the circuit so that the output of the circuit is lower in potential than the potential at the additional emitter whereby the driven transistor is prevented from going into saturation.
Claim 3
Dependent Claim
24 words
The structure of claim 1 wherein the output and the additional emitter are connected to spaced points on the collector of the driven 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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |