Interstage coupling methods and apparatus for transistor amplifiers

Claim 1

A TRANSISTOR AMPLIFIER HAVING A PLURALITY OF CASCADED STAGES WITH AN ASYMMETRICAL COUPLING NETWORK BETWEEN STAGES, SAID AMPLIFIER COMPRISING A COMMON RETURN CIRCUIT, FIRST AND SECOND TRANSISTORS EACH HAVING AN EMITTER, A BASE, AND A COLLECTOR, SAID BASES BEING CONNECTED TO THE COMMON RETURN CIRCUIT, MEANS FOR APPLYING OPERATING POTENTIALS TO SAID TRANSISTORS, A SIGNAL INPUT CIRCUIT CONNECTED TO THE EMITTER OF THE FIRST TRANSISTOR, A PARALLEL RESONANT CIRCUIT COMPRISING A FIRST CAPACITOR AND A FIRST INDUCTOR, SAID PARALLEL RESONANT CIRCUIT HAVING ONE SIDE THEREOF CONNECTED TO THE COLLECTOR OF THE FIRST TRANSISTOR, A SECOND CAPACITOR COUPLING THE OPPOSITE SIDE OF SAID PARALLEL RESONANT CIRCUIT TO THE COMMON RETURN CIRCUIT, SAID FIRST INDUCTOR HAVING A TAP THEREON, A SECOND AND THIRD INDUCTOR IN SERIAL RELATION, SAID TAP BEING CONNECTED TO THE SECOND INDUCTOR ON THE OPPOSITE END THEREOF FROM THE END WHICH IS CONNECTED TO SAID THIRD INDUCTOR, A THIRD CAPACITOR COUPLING SAID THIRD INDUCTOR TO THE COMMON RETURN CIRCUIT, A FOURTH CAPACITOR COUPLING THE EMITTER OF THE SECOND TRANSISTOR AT A POINT BETWEEN SAID SECOND AND THIRD INDUCTORS, SAID FOURTH CAPACITOR AND SAID THIRD INDUCTOR FORMING A SERIES-RESONANT CIRCUIT CONNECTED TO THE EMITTER OF THE SECOND STAGE, AND AN OUTPUT CIRCUIT CONNECTED TO THE COLLECTOR OF SAID SECOND TRANSISTOR.