High gain field-effect transistor-loaded amplifier

Claim 1

ELECTRIC SIGNAL AMPLIFYING MEANS, COMPRISING A SOLID-STATE AMPLIFIER INCLUDING A CONTROL ELECTRODE ADAPTED TO RECEIVE AN INPUT SIGNAL TO BE AMPLIFIED, AND A PAIR OF OUTPUT CIRCUIT ELECTRODES; A LOAD IMPEDANCE; A FIELD EFFECT TRANSISTOR INCLUDING SOURCE, DRAIN AND GATE ELECTRODES; A SOURCE OF DIRECT-CURRENT LOAD VOLTAGE; CONDUCTOR MEANS CONNECTING SUCCESSIVELY IN SERIES WITH SAID VOLTAGE SOURCE THE OUTPUT ELECTRODE CIRCUIT OF SAID AMPLIFIER, SAID LOAD IMPEDANCE, AND THE SOURCE TO DRAIN CIRCUIT OF SAID FIELD EFFECT TRANSISTOR, SAID CONDUCTOR MEANS CONTAINING A FIRST STAGE OUTPUT JUNCTION BETWEEN SAID LOAD IMPEDANCE AND SAID SOURCE ELECTRODE; A CAPACITOR CONNECTING SAID GATE ELECTRODE WITH A POINT ON SAID CONDUCTOR MEANS BETWEEN SAID IMPEDANCE AND THE AMPLIFIER OUTPUT CIRCUIT ELECTRODE CONNECTED THERETO; AN ADDITIONAL AMPLIFIER STAGE HAVING AN INPUT TERMINAL CONNECTED WITH SAID FIRST STAGE OUTPUT JUNCTION, A SECOND STAGE OUTPUT TERMINAL, AND A FEEDBACK OUTPUT TERMINAL; AND DIRECT-CURRENT BIAS MEANS FOR STABILIZING THE OUTPUT VOLTAGE OF SAID ADDITIONAL AMPLIFIER STAGE INCLUDING A RESISTOR CONNECTING SAID FEEDBACK OUTPUT TERMINAL WITH SAID GATE ELECTRODE.