. The Bell System technical journal . BY-PASS CONDENSER BY-PASSCONDENSER BY-PASSCONDENSER. BY-PASSCONDENSER BY-PASSCONDENSER Fig. 10a—Diode, negligible circuit 10b—Pentode, negligible circuit 10c—Pentode, impedance in grid circuit. cushioning effect of space charge. For anode-cathode spacings andoperating conditions such that the transit time is not too large a faction ofthe period of the frequency involved, F is of the order of 0,20 when thezero-field emission is several times larger than h ■ Under temperature-limited conditions F is unity. That is, under favorab
. The Bell System technical journal . BY-PASS CONDENSER BY-PASSCONDENSER BY-PASSCONDENSER. BY-PASSCONDENSER BY-PASSCONDENSER Fig. 10a—Diode, negligible circuit 10b—Pentode, negligible circuit 10c—Pentode, impedance in grid circuit. cushioning effect of space charge. For anode-cathode spacings andoperating conditions such that the transit time is not too large a faction ofthe period of the frequency involved, F is of the order of 0,20 when thezero-field emission is several times larger than h ■ Under temperature-limited conditions F is unity. That is, under favorable space-charge-limited conditions, the fluctuation noise component in h is only about 20%of the value for the same cathode current under temperature-limited condi-tions. Although the introduction of grids between the cathode and anode Fluctuations in Space-Charge-Limited Currents at Moderately High Frequencies,B. J. Thompson, D. O. North, W. A. Harris, R. C. A. Review, October 1940, Vol. 5, p. 244. 400 BELL SYSTEM TECHNICA L JOURNAL of the simple diode complicates the noise pr
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