Push-pull power amplifier counter-reacted by VHF transformers.

摘要

P The power amplifier of the push-pull type with two transistors comprises an adaptation transformer respectively at input (TE) and at output (TS) of the amplifier. It further comprises a double-winding feedback transformer respectively connected at the input (TCRE) and at the output (TCRS) of each of the transistors (11 and 12), such as the drain (16 and 17) of each transistor (11 and 12) is coupled to its respective gate (13 and 14) by the input feedback transformer (TE) to which it is connected and such that the gate (13 and 14) of each transistor (11 and 12) is coupled to its drain (16 and 17) by the output feedback transformer (TCRS) to which it is connected, the sources (9 and 10) of the two transistors (11 and 12) are connected to the ground potential (M) of the amplifier supply, the grids (13 and 14) are respectively connected to one end of the secondary winding (15) of the input matching transformer (TE), and the drains (16 and 17) are respectively connected to one end of the primary winding (18) of the output transformer (TS). BR/ Application: radio transmitter. /P