Voltage variable gain circuit with gate correction

Claim 1

A VOLTAGE VARIABLE GAIN CIRCUIT FOR AMPLITUDE MODULATING A DIRECT CURRENT INPUT SIGNAL IN ACCORDANCE WITH A SELECTED OPPOSITELY POLARIZED DIRECT CURRENT CONTROL SIGNAL, EACH OF SAID INPUT AND CONTROL SIGNALS BEING REFERENCED TO A COMMON REFERENCE POTENTIAL; COMPRISING FIRST AND SECOND ELECTRON DISCHARGE DEVICES, A COMMON LOAD ELEMENT CONNECTED TO OUTPUT ELEMENTS OF EACH OF SAID FIRST AND SECOND ELECTRON DISCHARGE DEVICES AND TO A SUPPLY VOLTAGE SOURCE, ONE TERMINAL OF WHICH DEFINES SAID REFERENCE POTENTIAL, SAID CONTROL SIGNAL BEING APPLIED TO A FIRST CONTROL ELEMENT OF SAID FIRST ELECTRON DISCHARGE DEVICE, SAID INPUT SIGNAL BEING APPLIED TO A SECOND CONTROL ELEMENT OF SAID FIRST ELECTRON DISCHARGE DEVICE, A FIRST OUTPUT TAKEN FROM SAID FIRST ELECTRON DISCHARGE DEVICE AS A COMPOSITE SIGNAL DETERMINED BY SAID FIRST AND SECOND INPUT SIGNALS THERETO AND APPLIED THROUGH SAID COMMON LOAD, A SECOND OUTPUT TAKEN FROM A THIRD CONTROL ELEMENT OF SAID FIRST ELECTRON DISCHARGE DEVICE AS AN INVERTED FORM OF SAID FIRST INPUT THERETO AND APPLIED BETWEEN SAID COMMON REFERENCE AND AN INPUT ELECTRODE OF SAID SECOND ELECTRON DISCHARGE DEVICE, THE OUTPUT OF SAID SECOND ELECTRON DISCHARGE DEVICE BEING ADDITIONALLY APPLIED TO SAID COMMON LOAD, AND MEANS FOR CONTROLLING THE AMPLITUDE OF THE INPUT TO SAID SECOND ELECTRON DISCHARGE DEVICE WITH RESPECT TO SAID COMMON REFERENCE WHEREBY THE OUTPUT FROM SAID SECOND DISCHARGE DEVICE MAY BE SELECTED TO REALIZE A CANCELLATION EFFECT OF THE CONTROL SIGNAL CHARACTERISTIC APPEARING IN SAID COMMON LOAD FROM THE OUTPUT SUPPLIED THERETO FROM SAID FIRST ELECTRON DISCHARGE DEVICE.