Monolithic power amplifier

Claim 1

AN ELECTRONIC AMPLIFIER INCLUDING, IN COMBINATION; (A) A PAIR OF DIFFERENTIALLY CONNECTED INPUT TRANSISTORS, ONE OF WHICH IS ADAPTED TO RECEIVE A SIGNAL TO BE AMPLIFIED, AND A FIRST CURRENT SINK CONNECTED TO A COMMON CURRENT OUTPUT POINT OF THE PAIR OF DIFFERENTIALLY CONNECTED TRANSISTORS FOR SINKING THE SUM OF THE CURRENTS WHICH FLOW DIFFERENTIALLY IN THE PAIR OF INPUT TRANSISTORS, (B) A LOAD IMPEDANCE CONNECTED BETWEEN ONE OF THE INPUT TRANSISTORS IN SAID PAIR AND A VOLTAGE SUPPLY TERMINAL FOR DEVELOPING A VARIABLE VOLTAGE THEREAT IN RESPONSE TO CHANGES IN THE LEVEL OF THE INPUT SIGNAL, (C) DC LEVEL SHIFTING MEANS CONNECTED TO SAID LOAD IMPEDANCE MEANS FOR PROVIDING A DC LEVEL SHIFT FROM THE DC VOLTAGE LEVEL APPEARING AT SAID LOAD IMPEDANCE MEANS, (D) A FIRST OUTPUT TRANSISTOR CIRCUIT PORTION CONNECTED BETWEEN SAID DC LEVEL SHIFTING MEANS AND AN OUTPUT TERMINAL AND RESPONSIVE TO CHANGES IN VOLTAGE AT SAID DC LEVEL SHIFTING MEANS TO PRODUCE A CORRESPONDING CHANGE IN THE VOLTAGE AT SAID OU TPUT TERMINAL, (E) A SECOND OUTPUT TRANSISTOR CIRCUIT PORTION CONNECTED BETWEEN SAID VOLTAGE SUPPLY TERMINAL AND SAID OUTPUT TERMINAL AND CONDUCTIVELY CONTROLLED BY THE VOLTAGE LEVEL AT SAID DC LEVEL SHIFTING MEANS, SAID FIRST AND SECOND OUTPUT TRANSISTOR CIRCUIT PORTIONS BEING ALTERNATELY DRIVEN INTO CONDUCTION ON EACH SUCCESSIVE HALF CYCLE OF THE INPUT SIGNAL, AND (F) A NEGATIVE FEEDBACK MEANS CONNECTED BETWEEN SAID OUTPUT TERMINAL AND THE OTHER OF SAID DIFFERENTIALLY CONNECTED INPUT TRANSISTOR.