High voltage d.c. coupled differential amplifier including series energized transistors

Claim 1

A CIRCUIT ARRANGEMENT COMPRISING A PLURALITY OF TRANSISTORS EACH HAVING EMITTER, BASE AND COLLECTOR ELECTRODES, A FIRST AND SECOND TRANSISTOR OF SAID PLURALITY ARRANGED IN DIFFERENTIAL AMPLIFIER CONNECTION, THE REMAINING TRANSISTORS OF SAID PLURALITY BEING EVENLY DIVIDED INTO FIRST AND SECOND GROUPS IN COMBINATION WITH SAID FIRST AND SECOND TRANSISTORS, INPUT TERMINALS FOR SUPPLYING DIFFERENTIAL ELECTRICAL INPUT SIGNALS TO THE BASES OF SAID FIRST AN SECOND TRANSISTORS, A SUPPLY SOURCE OF ELECTRICAL ENERGY, A FIRST RESISTOR IN SERIES WITH SAID SUPPLY SOURCE, ONE TERMINAL OF THE SERIES COMBINATION OF SAID FIRST RESISTOR AND SAID SUPPLY SOURCE BEING CONNECTED TO THE COLLECTOR OF THE LAST TRANSISTOR OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID FIRST GROUP, A SECOND RESISTOR IN SERIES WITH SAID SUPPPLY SOURCE, ONE TERMINAL OF THE SERIES COMBINATION OF SAID SECOND RESISTOR AND SUPPLY SOURCE BEING CONNECTED TO THE COL-S LECTOR OF THE LAST TRANSISTOR OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID SECOND GROUP, CIRCUIT MEANS PROVIDING A DIRECT CURRENT SERIES CONNECTION FROM THE COLLECTOR OF SAID FIRST TRANSISTOR ACROSS THE EMITTER-COLLECTOR PATHS OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID FIRST GROUP TO SAID ONE TERMINAL OF THE SERIES COMBINATION OF SAID FIRST RESISTOR AND SUPPLY SOURCE, CIRCUIT MEANS PROVIDING A DIRECT CURRENT SERIES CONNECTION FROM THE COLLECTOR OF SAID SECOND TRANSISTOR ACROSS THE EMITTER COLLECTOR PATHS OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID SECOND GROUP TO SAID ONE TERMINAL OF THE SERIES COMBINATION OF SAID SECOND RESISTOR AND SUPPLY SOURCE, THE OTHER TERMINAL OF SAID SUPPLY SOURCE BEING CONNECTED TO THE EMITTER OF SAID FIRST AND SECOND TRANSISTORS, A FIRST VOLTAGE DIVIDER CONNECTED FROM THE EMITTER OF SAID FIRST TRANSISTOR TO THE COLLECTOR OF THE LAST TRANSISTOR OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID FIRST GROUP, CIRCUIT MEANS CONNECTING EACH OF THE BASE ELECTRODES OF THE REMAINING OF SAID TRANSISTORS OF SAID PLURALITY OF TRANSISTORS IN SAID FIRST GROUP TO SEPARATE POINTS ON SAID FIRST VOLTAGE DIVIDER, A SECOND VOLTAGE DIVIDER CONNECTED FROM THE EMITTER OF SAID SECOND TRANSISTOR TO THE COLLECTOR OF THE LAST TRANSISTOR OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID SECOND GROUP, CIRCUIT MEANS CONNECTING EACH OF THE BASE ELECTRODES OF THE REMAINING OF SAID TRANSISTORS OF SAID PLURALITY OF TRANSISTORS IN SAID SECOND GROUP TO SEPARATE POINTS ON SAID SECOND VOLTAGE DIVIDER, A LOAD RESISTOR CONNECTED FROM THE COLLECTOR OF THE LAST TRANSISTOR OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID FIRST GROUP TO THE COLLECTOR OF THE LAST TRANSISTOR OF THE REMAINING OF SAID PLURALITY OF TRANSISTORS IN SAID SECOND GROUP, ELECTRICAL OUTPUT LINES LEADING FROM OPPOSITE ENDS OF THE LOAD RESISTOR, RESISTANCE MEANS CONNECTING THE SEPARATE POINTS ON SAID FIRST VOLTAGE DIVIDER TO THE ASSOCIATED SEPARATE POINTS ON THE SECOND VOLTAGE DIVIDER WHEREBY THE BASE CURRENT OF THE ASSOCIATED PAIRS OF TRANSISTORS REMAINS CONSTANT, THUS MAINTAINING AN EQUAL VOLTAGE DIVISION ACROSS THE SERIES CONNECTED TRANSISTORS.