Switching circuit for a ladder type digital to analog converter utilizing an alternating reference voltage

Claim 1

A SWITCHING CIRCUIT COMPRISING FIRST AND SECOND TRANSISTORS EACH HAVING BASE, EMITTER, AND COLLECTOR ELECTRODES, THE EMITTERS OF SAID FIRST AND SECOND TRANSISTORS BEING CONNECTED TOGETHER AT A JUNCTURE, A RESISTOR HAVING FIRST AND SECOND TERMINALS, SAID FIRST TERMINAL BEING CONCLUSIVE AND OPPOSING UNIDIRECTIONAL VOLTAGE SOURCES, SAID FIRST SOURCE BEING CONNECTED BETWEEN THE BASE OF SAID FIRST TRANSISTOR AND SAID SECOND TERMINAL, SAID SECOND SOURCE BEING CONNECTED BETWEEN THE BASE OF SAID SECOND TRANSISTOR AND SAID SECOND TERMINAL WHEREBY SAID FIRST AND SECOND TRANSISTORS ARE ALTERNATELY CONDUCTIVE, A VOLTAGE SOURCE CONNECTED BETWEEN THE COLLECTOR OF SAID SECOND TRANSISTOR AND A COMMON POINT, THE COLLECTOR OF SAID FIRST TRANSISTOR BEING CONNECTED TO SAID COMMON POINT, AND OUTPUT MEANS CONNECTED BETWEEN SAID JUNCTURE AND SAID COMMON POINT.