. The Bell System technical journal . Ra^ Re ii(Ra + ri, + i\) + kr, = vq hir, - r,J + IARl + >\ + Re- r„,) = 0 Circuit delerininant A = {Rq + n + r,){Ri^ -\- r,-V Re - r„) > 0 for stability Without feed back (r, = 0) Iterative impedance Rq = Re — >m , Rl = fb Circuit determinant A = {rb + Re — rnY Insertion Power Gain Gi = ( - -Y + Re - r,nj Nominal Type A Gain with Re = 36000without feed back 23with ft normal 21 Fig. 19—Synopsis of grounded emitter cascade. base Stage followed by a grounded collector and accordingly has the tubeanalog grounded-grid, cathode follower, from which one
. The Bell System technical journal . Ra^ Re ii(Ra + ri, + i\) + kr, = vq hir, - r,J + IARl + >\ + Re- r„,) = 0 Circuit delerininant A = {Rq + n + r,){Ri^ -\- r,-V Re - r„) > 0 for stability Without feed back (r, = 0) Iterative impedance Rq = Re — >m , Rl = fb Circuit determinant A = {rb + Re — rnY Insertion Power Gain Gi = ( - -Y + Re - r,nj Nominal Type A Gain with Re = 36000without feed back 23with ft normal 21 Fig. 19—Synopsis of grounded emitter cascade. base Stage followed by a grounded collector and accordingly has the tubeanalog grounded-grid, cathode follower, from which one would expect thatthe terminating impedances would be low and the interstage impedancehigh. This amplifier matched a 600-ohm line to better than 10% and had 16db insertion gain, with a bandwidth of about a megacycle. An adaptationfor video purposes was made to obtain over a band from 100 cycles to ,, an insertion gain of 20 db in a 75-ohm coaxial line. 388 BELL SYSTEM TECILMCAL JUlRSAL . I EQUIVALENT CIRCUIT. Kc|uati()iis:Terminalions: ii%i + h{%2 + Zn) = 0 Zn = Zj- = -%, + i(?u + ?-a)(l + \/l ^Z,, = Zo = -?u + hC^n + %,)i\ + Vl - .v) Circuit cietcrminanl A = ^(?u + ?i2)-(l — v + Vl — 3) i %i 2 ;2 Insertion Power Gain G; = —-■ , : Fig. 20—Sjnopsis of iterated cascade of four-poles. EQUIVALENT CIRCUITS V:i ^^^TJl (-) (2) Equations: /i(?ii + Zq) + il^vilf = gh%xlf^ iA—^zA = 0 ■Zl
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
