Feedback-stabilized multistage frequency-selective amplifier

Claim 1

A feedback-stabilized frequency-selective amplifier comprising: a plurality of cascaded amplification stages each including an active component with an input electrode, an output electrode and a common electrode; a plurality of coupling networks and a like plurality of feedback networks alternately inserted in a series chain between a signal-input terminal and a signal-output terminal, said input electrode of each active component being connected to a junction of a coupling network and a partly inductive feedback network of said chain in a network pair respectively associated therewith, said output electrode of each active component being connected to a downstream end of the associated feedback network; and a supply of direct current connected between the common electrodes of all active components and a downstream end of said chain proximal to said signal-output terminal for feeding operating power to said stages, said coupling networks having lower impedances than the associated feedback networks for signal frequencies lying within a predetermined band, at least the coupling and feedback networks downstream of the first of said stages having inductive branches conductively interconnected at their junctions with formation of a continuous low-resistance path for direct current from said supply to the output electrodes of all active components.