Transistor phase modulator

Claim 1

IN A PHASE MODULATION SIGNALING SYSTEM, A PHASE MODULATION CIRCUIT HAVING A FIRST INPUT TERMINAL TO WHICH CONSTANT PHASE CARRIER SIGNAL WAVES MAY BE APPLIED, A SECOND INPUT TERMINAL TO WHICH AUDIO MODULATION SIGNAL VOLTAGES MAY BE APPLIED, AND AN OUTPUT TERMINAL FOR PROVIDING PHASE MODULATED CARRIER WAVE SIGNALS, A TRANSISTOR WITH BASE, EMITTER AND COLLECTOR ELECTRODES AND HAVING A GIVEN TRANSCONDUCTANCE CHARACTERISTIC, SAID TRANSISTOR FURTHER EXHIBITING A GIVEN INPUT IMPEDANCE CHARACTERISTIC OF A SUBSTANTIALLY CAPACITIVE NATURE BETWEEN SAID BASE AND SAID EMITTER ELECTRODES, FIRST REACTANCE MEANS CONNECTED BETWEEN SAID FIRST INPUT TERMINAL AND SAID BASE ELECTRODE, SECOND REACTANCE MEANS CONNECTED BETWEEN SAID BASE AND COLLECTOR ELECTRODES, SAID FIRST AND SECOND REACTANCE MEANS HAVING SUBSTANTIALLY THE SAME VALUES, MEANS FOR CONNECTING SAID EMITTER ELECTRODE TO SAID SECOND INPUT TERMINAL WHEREBY SAID AUDIO MODULATION SIGNAL VOLTAGES ARE APPLIED BETWEEN SAID EMITTER AND SAID BASE ELECTRODES, SAID MODULATION VOLTAGES VARYING SAID TRANSCONDUCTANCE CHARACTERISTIC OF SAID TRANSISTOR TO THEREBY VARY THE PHASE SHIFT OF THE CARRIER WAVE SIGNALS, SAID TRANSISTOR INPUT IMPEDANCE EFFECTIVELY LIMITING THE AMOUNT OF PHASE SHIFT WHICH CAN BE PROVIDED , INDUCTANCE MEANS CONNECTED BETWEEN SAID COLLECTOR ELECTODE AND A REFERENCE POTENTIAL FOR NULLIFYING THE CAPACITIVE EFFECT OF SAID TRANSISTOR INPUT IMPEDANCE TO INCREASE SAID PHASE SHIFT CAPABILITY, AND CIRCUIT MEANS FOR CONNECTING SAID COLLECTOR ELECTRODE TO SAID OUTPUT TERMINAL.