The Insertion of an Extra Section into the Networks of a Distributed Amplifier

The overall voltage gain function of a distributed amplifier using standard constant-
k
LC
low-pass filter sections, with an extra section being inserted anywhere along the plate line, is given. It is shown that if the losses due to valve input conductance are small, then it is possible to maintain the gain constant to within
\pm 0.24 dB
over 90 percent of the passband.