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Image from page 441 of "The Bell System technical journal" (1922)

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説明Identifier: bell00systemvol31techniamerrichTitle: The Bell System technical journalYear: 1922 (1920s)Authors: American Telephone and Telegraph CompanySubjects: Telecommunication Electric engineering Communication Electronics Science TechnologyPublisher: [Short Hills, N.J., etc., American Telephone and Telegraph Co.]Contributing Library: Prelinger LibraryDigitizing Sponsor: Internet ArchiveView Book Page: Book ViewerAbout This Book: Catalog EntryView All Images: All Images From BookClick here to view book online to see this illustration in context in a browseable online version of this book.Text Appearing Before Image:\(^^ ^^^^ .^^^^^ ^^^^ ^^ ^^^^ 0 ^ ^--^^^^^ ^^^^Js- • ^ ^ REGION I-- / 1 ■* REGIONS n, m- Fig. 17—Idealized emitter characteristics — slope = Ru 428 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1952 manding that alpha, as a function of /«, go through a transition from anegUgible vahie (at small negative le) to a value well in excess of unity(at a correspondingly small positive value of /«) and maintain its valuewell in excess of unity at large values of /«, conditions (b) and (c) canbe met. In Fig. 20 are given the characteristic specifications which must bemet by the M1689 bead type switching transistor now under develop-ment. With these kinds of limits, circuit users find it possible to inter-change such M1689 units in various pulse circuits and obtain ovei-allcircuit behavior reproducible to the order of about dz2 db. Ic= -5.5 MA ic= riw -2MA 1 ■VcIc r^ Leryr^^ Vci VC3 ^^ -n / / 7 7 / / /^° i 1, /, / / / /--- Vc=- J J y ./,/ o/ Fig. 18—Idealized collector characteristics.Text Appearing After Image:0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9EMITTER CURRENT, If , IN MILLIAMPERES Fig. 19— Effective alpha characteristic. PRESPJNT STATUS OF TRANSISTOR DEVKLOPMENT 429 TEST CONDITIONS MINIMUM MAXIMUM Tco-OFF COLLECTORDC RESISTANCE Vc = - 35 V DCIg = OMA DC 17,500 OHMS Vc,-ON COLLECTORVOLTAGE Ic = -2MA DCIf = I MA DC -3V DC Vc3-0N COLLECTORVOLTAGE I(. = - 5.5 MA DCIf - 3 MA DC -4V DC OFF EMITTERRESISTANCE Vc = -10 V DC 50,000 OHMS ON EMITTERRESISTANCE R„ V(- = -10 V DCIf = 1 MA DC 800 OHMS ai Vc = - 30 V DCIf = 1.0 MA DC 1.5 32 Vc = -30 V DCIf = + 0.05 MA DC 2.0 ^3 Vc = - 30 V DCIf = - 0.1 MA DC 0.3 Rl2 - OPEN CIRCUITFEEDBACK RESISTANCE Vc = -10 V DCIf = +1 MA DC 500 OHMS R21 - OPEN CIRCUITFORWARD RESISTANCE Vc = -10 V DCIf = +1 MA DC 15,000 OHMS R22 - OPEN CIRCUITOUTPUT RESISTANCE Vc = -10 V DCIf = +1MA DC 10,000 OHMS Fig. 20—Tentative characteristics for the M1689 switching transistor. RELIABILITY FIGURE OF MERIT SEPTEMBER1949 JANUARY1952 AVERAGELIFE = 10,000 HOURS > 70,000 HOURS EQNote About ImagesPlease note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
撮影日1922-01-01 00:00:00
撮影者Internet Archive Book Images
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