. The Bell System technical journal . , and 1. The curves demonstrate regions of negative capacitanceas well as of negative conductance. Note that as the parameter (p ismade smaller both the capacitance and conductance pass through 476 BELL SYSTEM TECHNICAL JOURNAL /■ . 1 \I \ 1 1 I \I L 1 02 11 i 0 123456789 10 INTEGRATION CONSTANT /F Fig 5—Relative input capacitance of an idealized space charge grid tube for differentspace charge conditions (voltage ratio <p = ). z -12 ■20 / ^- ■ / Di D2 1 V 0 2 4 6 8 10 12 14 16 18 20 INTEGRATION CONSTANT JT Fig. 6—Relative input capacitance
. The Bell System technical journal . , and 1. The curves demonstrate regions of negative capacitanceas well as of negative conductance. Note that as the parameter (p ismade smaller both the capacitance and conductance pass through 476 BELL SYSTEM TECHNICAL JOURNAL /■ . 1 \I \ 1 1 I \I L 1 02 11 i 0 123456789 10 INTEGRATION CONSTANT /F Fig 5—Relative input capacitance of an idealized space charge grid tube for differentspace charge conditions (voltage ratio <p = ). z -12 ■20 / ^- ■ / Di D2 1 V 0 2 4 6 8 10 12 14 16 18 20 INTEGRATION CONSTANT JT Fig. 6—Relative input capacitance of an idealized space charge grid tube for differentspace charge conditions (voltage ratio <p = ). IMPEDANCE PROPERTIES OF ELECTRON STREAMS 477 zero for smaller values of ^. Consider for instance the case for which(f = The capacitance is here negative even in regions of smallspace charge and it is seen that over a wide range of the parameter ^the capacitance is nearly constant. Both capacitance and conductance. , —^ 1 KIPP I 6 8 10 12 14 INTEGRATION CONSTANT ^i 20 Fig. 7—Relative input conductance of an idealized space charge grid tube for different space charge conditions.
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