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Image from page 412 of "The Bell System technical journal" (1922)

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説明Identifier: bellsystemtechni28amerrichTitle: 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:l valueof a few hundred ohms, the question of stability becomes important. Thenominal Type A transistor is still stable when the cascade interstages arematched, the gain rising to about 21 db per stage. For many units havingmore than the usual amount of feedback, the interstages cannot be matchedwithout violating the stability condition and therefore encountering os- SUM/-: ClRCl IT A.SlKCTS Oi Till. TR.WSISTDK 5H5i dilations; but one can normally count on stable gains of 15 to 20 db perstage, the transformers being perhaps somewhat mismatched. Interesting possibilities for a good cascade amplifier with more gain thanthe grounded base cascade are offered by the grounded emitter connection,incidentally, this gain advantage is also enjoyed by the grounded cathodeor conventional tube connection, so that one would exi>ect it to apply herefrom the electron tube analogy; but in transistors the feature that a may begreater than 1 brings in complications having no simple analogy for tubes.Text Appearing After Image:Without feed back (<-j^i2 = 0):Iterative impedance Rg = fJvsi . -^l = fivuCircuit determinant A = (^u + 9^22)^ R21 \^ Insertion Power Gain Gj = Nominal Tjpe A Gain = S* Fig. 17—Synojisis of grounded laase cascade. The iterated grounded emitter cascade without feedback (that is, emitterresistance Vo = 0) is unstable for the nominal Type A transistor, but can bestabilized in many ways of which we shall mention only one. The equivalentcircuit of Fig. 19 shows an added resistor which may be thought of as ad-justing the value of the collector resistance, and tends to make the unitmore stable. When this resistor is adjusted to make the total collectorresistance Re about equal to the net mutual resistance fm, thus reducingthe effective value of a to the neighborhood of unity, then the cascade am-{)lifier becomes stable, its gain being sensitive to the e.xact value chosen forthe adjusting resistor. A numerical calculation for the grounded emitter 386 BELL SYSTEM TECHNICAL JOURNAL amplifiNote 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
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