US3836995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor darlington circuit
Assignee: RCA Corp
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Filing: 1973-05-25
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Granted: 1974-09-17
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Expires: 1993-05-25
Abstract
Abstract A semiconductor integrated Darlington circuit is provided comprising two transistors, two resistors, and a diode within a body of semiconductor material. The emitter region of one of the transistors completely encircles the emitter region of the other transistor at a surface of the body, whereby certain paths for current from the base contact of the one transistor beneath and around the emitter region thereof are significantly longer than those present in prior art devices, thus contributing to a higher value of one of the device resistors.
Inventors
- 👤 C Wheatley
- 👤 W Einthoven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:16
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/60; H10D84/641; H10D84/642; H10D84/611; H10D84/613; H10W; H10W72/00; H10W72/20; H10W72/90; H10W72/071; H10W72/073; H10W72/30; H10W72/351; H10W72/352; H10W72/50; H10W72/59; H10W72/941; H10W72/944
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A semiconductor integrated circuit comprising: a body of semiconductor material having a surface, various regions within said body forming emitter, base, and collector regions of two transistors, said emitter and base regions extending into said body from said surface and being defined, at said surface, by surface intercepts of said regions, the surface intercept of the emitter region of one of said transistors surrounding a surface intercept of the base region of said one transistor, and substantially surrounding the surface intercept of the emitter region of the other of said transistors.
Claim 2
Dependent Claim
91 words
A semiconductor integrated circuit comprising: a body of semiconductor material having a surface, various regions within said body forming emitter, base, and collector regions of two transistors, said emitter and base regions extending into said body from said surface and being defined, at said surface, by surface intercepts of said regions, the surface intercept of the emitter region of one of said transistors surrounding a surface intercept of the base region of said one transistor, and substantially surrounding the surface intercept of the emitter region of the other of said transistors.
Claim 3
Dependent Claim
58 words
The integrated circuit of claim 1 wherein: the emitter regions of said two transistors are separated by a portion of said base region at said surface, and including a metal contact on said surface, said metal contact being in ohmic contact with said surrounding emitter region and said portion of said base region separating said two emitter regions.
Claim 4
Dependent Claim
38 words
The integrated circuit of claim 2 wherein: said surrounding emitter region is surrounded, at said surface, by another portion of said base region and forms a junction therewith, and said metal contact is disposed entirely within said junction.
Claim 5
Dependent Claim
198 words
A semiconductor integrated circuit comprising: a body of semiconductor material having a surface, regions of P and N type conductivity extending into said body from said surface forming emitter and base regions of two transistors, said regions being defined, at said surface, by surface intercepts of said regions, the base regions of said two transistors being integral with one another and including portions thereof disposed beneath said emitter regions, said base region including first and second surface intercepts surrounding first and second surface intercepts, respectively, of said emitter regions, said emitter region first surface intercept surrounding a third surface intercept of said base region, said base region third surface intercept being spaced from said first and second base region surface intercepts and being surrounded by said base region first surface intercept, and said emitter region first surface intercept surrounding said base region second surface intercept, and metal contacts on said surface, one of said contacts ohmically connected to said first emitter region and having a first continuous edge disposed entirely within and out of contact with said base region first surface intercept, and a second edge surrounding and ohmically connected to said base region second surface intercept portion.
Claim 6
Dependent Claim
198 words
A semiconductor integrated circuit comprising: a body of semiconductor material having a surface, regions of P and N type conductivity extending into said body from said surface forming emitter and base regions of two transistors, said regions being defined, at said surface, by surface intercepts of said regions, the base regions of said two transistors being integral with one another and including portions thereof disposed beneath said emitter regions, said base region including first and second surface intercepts surrounding first and second surface intercepts, respectively, of said emitter regions, said emitter region first surface intercept surrounding a third surface intercept of said base region, said base region third surface intercept being spaced from said first and second base region surface intercepts and being surrounded by said base region first surface intercept, and said emitter region first surface intercept surrounding said base region second surface intercept, and metal contacts on said surface, one of said contacts ohmically connected to said first emitter region and having a first continuous edge disposed entirely within and out of contact with said base region first surface intercept, and a second edge surrounding and ohmically connected to said base region second surface intercept portion.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |