Neutralized direct-coupled differential amplifier including positive and negative feedback loops

Claim 1

A TRANSISTOR AMPLIFIER COMPRISING FIRST AND SECOND TRANSISTORS EACH HAVING AN EMITTER ELECTRODE, A BASE ELECTRODE AND A COLLECTOR ELECTRODE CONNECTED IN DIFFERENTIAL AMPLIFIER CONFIGURATION, SAID FIRST TRANSISTOR BEING ADAPTED TO RECEIVE AN INPUT SIGNAL AND SAID SECOND TRANSISTOR HAVING A COLLECTOR LOAD IMPEDANCE, A THIRD TRANSISTOR HAVING EMITTER, BASE AND COLLECTOR ELECTRODES COUPLED TO SAID SECOND TRANSISTOR AND SAID COLLECTOR LOAD IMPEDANCE IN POWERAMPLIFYING ARRANGEMENT, AND AN EMITTER-CIRCUIT IMPEDANCE FOR SAID THIRD TRANSISTOR INCLUDING A NEGATIVE FEEDBACK CIRCUIT DIRECT-COUPLED TO SAID SECOND TRANSISTOR AND A POSITIVE FEEDBACK CIRCUIT DIRECT-COUPLED TO THE COLLECTOR OF SAID FIRST TRANSISTOR IN AN ARRANGEMENT TO NEUTRALIZE THE BASE-COLLECTOR IMPEDANCE OF SAID FIRST TRANSISTOR AND TO ENERGIZE SAID FIRST AND THIRD TRANSISTORS SERIALLY FOR POWER, SAID EMITTER CIRCUIT IMPEDANCE INCLUDING A CONSTANT VOLTAGE DEVICE CONNECTED BETWEEN SAID NEGATIVE AND POSITIVE FEEDBACK CIRCUITS TO STABILIZE VOLTAGE BIASES FOR SAID FIRST AND SECOND TRANSISTORS.