US3909636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor large scale integrated circuit chip having current switching type logical circuits
Assignee: Hitachi Ltd
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Filing: 1974-03-26
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Granted: 1975-09-30
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Expires: 1994-03-26
Abstract
Abstract A semiconductor large scale integrated circuit chip is characterized in that current switching type logical circuits are arranged at the central part of the chip, each of the logical circuits having a current source which is so constructed as to be capable of changing its current value through a change in its connection. Emitter-follower transistors are arranged at the peripheral part of the chip, each of the emitter-follower transistors receiving the output of the current switching type logical circuit as its base input, and a resistor as a load resistor of the current switching type logical circuit is connected to the base of the transistor.
Inventors
- 👤 Akira Masaki
- 👤 Yutaka Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:54
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/08; H03K19/082; H03K19/086
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
In a semiconductor large scale integrated circuit chip having: a plurality of current switching logic circuits arranged at an interior portion of said chip, eaCh current switching logic circuit comprising: a current source, and at least two current switching transistors, the emitters of which are connected in common to said current source; and a plurality of emitter follower transistors arranged at a peripheral portion of said chip relative to said interior portion thereof; the improvement wherein each of said emitter follower transistors has its base connected to the collector of a current switching transistor located at said interior portion of said chip, and wherein a first collector load resistor for a current switching transistor located at said interior portion of said chip is connected to the base of each emitter-follower transistor, said first collector load resistor being located adjacent said emitter-follower transistor at the peripheral portion of said chip.
Claim 2
Dependent Claim
149 words
In a semiconductor large scale integrated circuit chip having: a plurality of current switching logic circuits arranged at an interior portion of said chip, eaCh current switching logic circuit comprising: a current source, and at least two current switching transistors, the emitters of which are connected in common to said current source; and a plurality of emitter follower transistors arranged at a peripheral portion of said chip relative to said interior portion thereof; the improvement wherein each of said emitter follower transistors has its base connected to the collector of a current switching transistor located at said interior portion of said chip, and wherein a first collector load resistor for a current switching transistor located at said interior portion of said chip is connected to the base of each emitter-follower transistor, said first collector load resistor being located adjacent said emitter-follower transistor at the peripheral portion of said chip.
Claim 3
Dependent Claim
27 words
The improvement according to claim 1, wherein said current source includes means by which the value of current supplied by said current source can be selectively changed.
Claim 4
Dependent Claim
117 words
The improvement according to claim 1, wherein said current source includes a pair of resistors of different values selectively connectable therewith, for controlling the value of current supplied by said current source to said switching transistors, and wherein said at least two current switching transistors comprise at least one first transistor having its emitter connected to said current source, an input signal terminal connected to its base, and a second collector load resistor and a first output terminal connected to its collector, and a second transistor having its emitter connected to said current source, a reference signal terminal connected to its base, and a third collector load resistor and a second output terminal connected to its collector.
Claim 5
Dependent Claim
64 words
The improvement according to claim 1, further including second and third collector load resistors connected to the collectors of respective ones of said current switching transistors, said second and third collector load resistors being located adjacent said current switching transistors at the interior portion of said chip and having a resistance value substantially greater than the resistor value of the first collector load resistor.
Claim 6
Dependent Claim
66 words
The improvement according to claim 1, wherein said current source comprises a transistor, the collector of which is connected to the emitters of said current switching transistors, the base of which is connected to a reference potential terminal, and further includes a pair of emitter resistors, the values of which are substantially different from each other, selectively connectable with the emitter of the current source transistor.
Claim 7
Dependent Claim
81 words
The improvement according to claim 1, wherein each of said current switching logic circuits further comprises: first and second interior output transistors, the base of each of which is connected to the collector of a current switching transistor, the collector of each of which is connected to a first source of reference potential, and the emitter of each of which is connected to through a resistor to a second source of reference potential, and is connected to an interior output terminal.
Claim 8
Dependent Claim
117 words
The improvement according to claim 6, wherein said current source includes a pair of resistors of different values selectively connectable therewith, for controlling the value of current supplied by said current source to said switching transistors, and wherein said at least two current switching transistors comprise at least one first transistor having its emitter connected to said current source, an input signal terminal connected to its base, and a second collector load resistor and a first output terminal connected to its collector, and a second transistor having its emitter connected to said current source, a reference signal terminal connected to its base, and a third collector load resistor and a second output terminal connected to its collector.
Claim 9
Dependent Claim
64 words
The improvement according to claim 3, further iNcluding second and third collector load resistors connected to the collectors of respective ones of said current switching transistors, said second and third collector load resistors being located adjacent said current switching transistors at the interior portion of said chip and having a resistance value substantially greater than the resistor value of the first collector load resistor.
Claim 10
Dependent Claim
64 words
The improvement according to claim 7, further including second and third collector load resistors connected to the collectors of respective ones of said current switching transistors, said second and third collector load resistors being located adjacent said current switching transistors at the interior portion of said chip and having a resistance value substantially greater than the resistor value of the first collector load resistor.
Claim 11
Dependent Claim
61 words
The improvement according to claim 9, wherein said current source comprises a transistor, the collector of which is connected to the emitters of said current switching transistors, the base of which is connected to a reference potential terminal, and an emitter, and further includes said pair of resistors of different values selectively connectable with the emitter of the current source transistor.
Claim 12
Dependent Claim
66 words
The improvement according to claim 8, wherein said current source comprises a transistor, the collector of which is connected to the emitters of said current switching transistors, the base of which is connected to a reference potential terminal, and further includes a pair of emitter resistors, the values of which are substantially different from each other, selectively connectable with the emitter of the current source transistor.
Claim 13
Dependent Claim
66 words
The improvement according to claim 4, wherein said current source comprises a transistor, the collector of which is connected to the emitters of said current switching transistors, the base of which is connected to a reference potential terminal, and further includes a pair of emitter resistors, the values of which are substantially different from each other, selectively connectable with the emitter of the current source transistor.
Claim 14
Dependent Claim
25 words
The improvement according to claim 3, wherein the values of said first load resistors adjacent the emitter follower transistors are respectively different from each other.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |