Complementary symmetry transistor amplifier having a constant common connection operating potential

Claim 1

IN A TRANSISTOR AMPLIFIER HAVING A COMMON-EMITTER DRIVER STAGE DIRECTLY COUPLED TO AN OUTPUT STAGE WHICH INCLUDES TWO TRANSISTORS CONNECTED IN COMPLEMENTARY SYMMETRY WITH RESPECT EMITTERS CONNECTED IN COMMON, SAID COMMON CONNECTION BEING AT A PRESCRIBED OPERATING POTENTIAL, FEEDBACK MEANS CONNECTED BETWEEN SAID OUTPUT STAGE AND SAID DRIVER STAGE FOR MAINTAINING SAID OPERATING POTENTIAL CONSTANT WHEN THE AMPLIFIER IS DYNAMICALLY OPERATED, SAID FEEDBACK MEANS COMPRISING A CONTROL TRANSISTOR HAVING AN EMITTER, COLLECTOR AND BASE, A VOLTAGE DIVIDER NETWORK CONNECTED ACROSS A FIXED UNIDIRECTIONAL VOLTAGE SOURCE, SAID CONTROL TRANSISTOR HAVING ITS BASE CONNECTED TO SAID VOLTAGE DIVIDER FOR MAINTAINING A FIXED EMITTER-BASE BIAS AND HAVING ITS EMITTER COUPLED TO SAID COMMON CONNECTION, THE COLLECTOR OF SAID CONTROL TRANSISTOR BEING COUPLED TO THE INPUT OF SAID DRIVER STAGE, THE CURRENT IN THE COLLECTOR CIRCUIT OF SAID CONTROL TRANSISTOR BEING REPRESENTATIVE OF SAID OPERATING POTENTIAL OF SAID COMMON CONNECTION, SAID DRIVER STAGE BEING RESPONSIVE TO CHANGE IN THE COLLECTOR CURRENT OF SAID CONTROL TRANSISTOR FOR MAINTAINING SAID COMMON CONNECTION AT THE PRESCRIBED OPERATING POTENTIAL.