. The Bell System technical journal . p-n-p ■llOK 100 K POT. MANUAL ZERO SET I + 33V I + OUT 5>UH -45V -27V +33V Fig. 8 —■ DC summing amplifier. 310 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 120 100 UJ U 80 LU o z 60 < --T .- — 364 LOCAL _FEEDBACK^- ^- .-1 41,000 -^ ^ d 6 630 \, . 12 N\ ?,000 , s^-> ^-. S \ \ V\\V 2ND •^^ STAGE ^ s \ -.^-. 1ST & 3RDSTAGES N \ ^■-S;, ^ \, \\ > \ 10 10-^ 10- 10 10 FRFOUENCY IN CYCLES PER SECOND Fig. 9 — Gain-frequency asymptotes for summing amplifier. is generated in the first transistor stage. If the transistor in th
. The Bell System technical journal . p-n-p ■llOK 100 K POT. MANUAL ZERO SET I + 33V I + OUT 5>UH -45V -27V +33V Fig. 8 —■ DC summing amplifier. 310 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 120 100 UJ U 80 LU o z 60 < --T .- — 364 LOCAL _FEEDBACK^- ^- .-1 41,000 -^ ^ d 6 630 \, . 12 N\ ?,000 , s^-> ^-. S \ \ V\\V 2ND •^^ STAGE ^ s \ -.^-. 1ST & 3RDSTAGES N \ ^■-S;, ^ \, \\ > \ 10 10-^ 10- 10 10 FRFOUENCY IN CYCLES PER SECOND Fig. 9 — Gain-frequency asymptotes for summing amplifier. is generated in the first transistor stage. If the transistor in the firststage has a noise figure less than 10 db at 1,000 cycles per second, thenthe RMS output noise voltage is less than millivolts. Fig. 9 shows a plot of the gain-frequency asymptotes for the sum-ming amplifier determined from (13), (14), (15), (17), and (A6) underthe assumption that the alphas and alpha-cutoff frequencies of the tran-sistors are and 3 mc, respectively. The corner frequencies intro-duced by
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