US3751726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device employing darlington circuit
Assignee: RCA Corp
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Filing: 1971-11-18
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Granted: 1973-08-07
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Expires: 1991-11-18
Abstract
Abstract A device employs two emitters in a common base region having a base-collector junction which only intersects a mesa edge of the device. A distributed resistance is defined between a base contact and a conductive layer substantially uniformly overlapping the outer periphery of one of the emitters which completely surrounds the base contact.
Inventors
- 👤 W Einthoven
- 👤 C Wheatley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:06
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/60; H10D84/611; H10D84/613; H10D62/00; H10D62/10; H10D62/13; H10D62/133; H10D84/641; H10D84/642
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
207 words
A semiconductor device comprising: a semiconductor body having upper and lower opposed surfaces and a side surface, a collector region of one type conductivity in said body adjacent to said lower surface, a base region of a type conductivity opposite to said one type conductivity in said body adjacent to said upper surface and forming a PN junction with said collector region, an annular first emitter region of said one type conductivity extending into said base region and completely surrounding a portion of said base region at said upper surface, another portion of said base region completely surrounding the outer periphery of said first emitter at said upper surface, a second emitter region of said one type conductivity extending into said another portion of said base region and being surrounded thereby at said upper surface, said second emitter region having an inner periphery substantially uniformly spaced from and surrounding a substantial portion of the outer periphery of said first emitter region, said another portion of said base region including an extension protruding into the second emitter region at said inner periphery thereof; and a first conductive layer on said upper surface overlying a portion of said first emitter region and a portion of the surrounding base region.
Claim 2
Dependent Claim
207 words
A semiconductor device comprising: a semiconductor body having upper and lower opposed surfaces and a side surface, a collector region of one type conductivity in said body adjacent to said lower surface, a base region of a type conductivity opposite to said one type conductivity in said body adjacent to said upper surface and forming a PN junction with said collector region, an annular first emitter region of said one type conductivity extending into said base region and completely surrounding a portion of said base region at said upper surface, another portion of said base region completely surrounding the outer periphery of said first emitter at said upper surface, a second emitter region of said one type conductivity extending into said another portion of said base region and being surrounded thereby at said upper surface, said second emitter region having an inner periphery substantially uniformly spaced from and surrounding a substantial portion of the outer periphery of said first emitter region, said another portion of said base region including an extension protruding into the second emitter region at said inner periphery thereof; and a first conductive layer on said upper surface overlying a portion of said first emitter region and a portion of the surrounding base region.
Claim 3
Dependent Claim
31 words
A semiconductor device as defined in claim 1 further comprising a second conductive layer on said upper surface overlying said base region extension and a portion of said second emitter region.
Claim 4
Dependent Claim
37 words
A semiconductor device as defined in claim 2 wherein the periphery of said base region extension within said second emitter region is substantially uniformly spaced from oppositely disposed portions of the outer periphery of said second emitter.
Claim 5
Dependent Claim
52 words
A semiconductor device as in claim 2 wherein said base region extension comprises a first area within said second emitter and a channel region connecting said first area to a portion of said base region outside said second emitter, said channel region having a width less than that of said first area.
Claim 6
Dependent Claim
20 words
A semiconductor device as defined in claim 4, wherein said second conductive layer overlies a portion of said channel region.
Claim 7
Dependent Claim
34 words
A semiconductor device as defined in claim 5, further comprising a third conductive layer on said upper surface overlying that portion of said base region surrounding the outer periphery of said second emitter region.
Claim 8
Dependent Claim
23 words
A semiconductor device as defined in claim 6, further comprising means for electrically connecting said first conducting layer to said third conductive layer.
Claim 9
Dependent Claim
51 words
A semiconductor device as defined in claim 7, wherein said connecting means comprises an extension of said first conductive layer connected to said third conductive layer, said extension overlying a portion of said base region where said second emitter region does not surround the outer periphery of said first emitter region.
Claim 10
Dependent Claim
53 words
A seMiconductor device as defined in claim 8, further comprising: said first emitter region having a tab extending into that portion of said base region where said second emitter region does not surround the outer periphery of said first emitter region; and wherein said extension of said first conductive layer overlies said tab.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |