A basic concept to reduce the frequency distortion of distributed amplifiers

It is shown that a frequency-independent attenuation and wave impedance can be obtained for relatively lossy transmission lines. The approach is based on a concept for avoiding dispersive distortions on telecommunication lines by introducing distortion-free lines. A derivation shows that the attenuation and characteristic impedance become frequency-independent of the conductance, G≐ is increased so that R´/L´=G´/C´. This can be done by modifying the bias until the correct value of G´ is obtained. This is particularly true when transistors which provide through their structure (such as doping profiles) the capability of fine-tuning the RF input currents, possibly by means of additional electrodes, are employed