Broadband amplifier

Claim 1

A SINGLE-STAGE PREAMPLIFIER FOR SIGNALS IN SEPARATED FREQUENCY BANDS FROM A TELEVISION ANTENNA COMPRISING AN UNBALANCED DOUBLE-TUNED INPUT CIRCUIT FOR PASSING THE SEPARATED FREQUENCY BANDS, A CIRCUIT FOR TRANSFORMING A 300 OHM BALANCE TRANSMISSION LINE IMPEDANCE TO A LOWER IMPEDANCE OF SAID UNBALANCED INPUT CIRCUIT, A TRANSISTOR HAVING ITS BASE ELECTRODE CONNECTED TO THE OUTPUT OF SAID DOUBLE-TUNED INPUT CIRCUIT, AND OUTPUT CIRCUIT CONNECTED ACROSS THE PATH OF THE COLLECTOR AND EMITTER OF SAID TRANSISTOR AND INCLUDING TWO DOUBLE-TUNED NETWORKS HAVING SERIES AND SHUNT REACTANCE ELEMENTS, A FIRST ONE OF SAID NETWORKS HAVING INPUT AND OUTPUT INDUCTANCE-CAPACITANCE BRANCHES TUNED TO A FREQUENCY NEAR ONE END OF ONE OF SAID FREQUENCY BANDS, AND AN INTERMEDIATE SHUNT INDUCTANCE CAPACITANCE BRANCH TUNED TO SET THE OTHER END OF SAID ONE FREQUENCY BAND AND WHICH BRANCH IS CONNECTED TO THE JUNCTION OF THE INPUT AND OUTPUT BRANCHES, THE SECOND ONE OF SAID NETWORKS HAVING INPUT AND OUTPUT INDUCTANCE-CAPACITANCE BRANCHES TUNED TO A FREQUENCY NEAR ONE END OF THE OTHER OF SAID FREQUENCY BANDS, AND AN INTERMEDIATE SERIES INDUCTANCE CAPACITANCE BRANCH CONNECTED IN SERIES WITH SAID INPUT AND OUTPUT BRANCHES TUNED TO SET THE OTHER END OF SAID OTHER FREQUENCY BAND, ONE OF SAID INPUT AND OUTPUT BRANCHES FOR SAID ONE BAND AND SAID INTERMEDIATE INDUCTANCE BRANCH BEING CONNECTED IN SERIES WITH ONE OF SAID INPUT AND OUTPUT BRANCHES FOR SAID OTHER BAND AND ACROSS SAID COLLECTOR-EMITTER PATH, AND THE OTHER OF SAID INPUT AND OUTPUT BRANCHES FOR EACH OF SAID BANDS BEING CONNECTED IN EFFECTIVE PARALLEL PATHS TO A COMMON OUTPUT TERMINAL IN AN UNBALANCED LINE CONFIGURATION, A CIRCUIT FOR TRANSFORMING THE IMPEDANCE OF A 300 OHM BALANCED OUTPUT TRANSMISSION LINE TO THE LOWER IMPEDANCE OF SAID OUTPUT CIRCUIT AS SAID OUTPUT TERMINALS, AND A RECTIFIER AND FILTER CONNECTED TO SAID OUTPUT IMPEDANCE TRANSFORMING CIRCUIT FOR PROVIDING A DIRECT VOLTAGE TO SAID BASE OF SAID TRANSISTOR FROM AN EXTERNALLY SUPPLIED ALTERNATING SIGNAL ON THE OUTPUT TRANSMISSION LINE.