NEGATIVE FEEDBACK AMPLIFIER

摘要

PURPOSE:To increase the power gain of a high-gain negative feed-back amplifier used for a coaxial repeater, etc., by preventing the input and output currents of a transistor after being fed back from flowing the same element by using a balance- unbalance converter circuit. CONSTITUTION:Initial-stage transistor 7 is connected to input terminal 1 via input- side hybrid transformer 3, and intermediate-stage commen collector transistor 8 and post-state common emitter transistor 9 are connected via balance-unbalance converter circuit 11 and then connected to output terminal 2 via output-side hybrid transformer 4. Elements 5 and 6 are external resistances connected to windings of input-side and output-side hybrid transformers 3 and 4, and element 10 is a feedback circuit network coupling input and output terminals together.