Dynamic bandpass filter amplifier having multiple feedback paths

Claim 1

A DYNAMIC BANDPASS FILTER-AMPLIFIER UTILIZING TRANSISTORS OPERATED IN THE COMMON-COLLECTOR MODE, AND CHARACTERIZED BY A PASS BAND VOLTAGE GAIN EXCEEDING UNITY, THE FILTER-AMPLIFIER COMPRISING: A COMPOUND CONNECTED TRANSISTOR CIRCUIT INCLUDING FIRST AND SECOND TRANSISTORS EACH HAVING A COLLECTOR, A BASE, AND AN EMITTER, THE EMITTER OF THE FIRST TRANSISTOR BEING CONNECTED TO THE BASE OF THE SECOND TRANSISTOR AND THE COLLECTORS OF THE TRANSISTORS BEING INTERCONNECTED FOR COMMON COLLECTOR MODE OPERATION; AN INPUT TERMINAL FOR ACCOMMODATING A VARIABLE-FREQUENCY INPUT SIGNAL SOURCE; AN INPUT-SIGNAL COUPLING CAPACITOR CONNECTED BETWEEN THE INPUT TERMINAL AND THE BASE OF THE FIRST TRANSISTOR, THE COUPLING CAPACITOR HAVING A REACTIVE IMPEDANCE IN EXCESS OF THE INPUT IMPEDANCE OF THE COMPOUND CONNECTED TRANSISTOR CIRCUIT WHENEVER THE INPUT SIGNAL FREQUENCY IS LESS THAN A PREDETERMINED FREQUENCY WITHIN THE PASS BAND; MEANS COUPLED TO THE COMPOUND CONNECTED TRANSISTOR CIRCUIT FOR BIASING SAME FOR OPERATION IN THE COMMONCOLLECTOR MODE, THE BIASING MEANS INCLUDING, A BASE-BIASING RESISTOR COUPLED TO THE COMPOUND CONNECTED TRANSISTOR CIRCUIT AT A JUNCTION BE-