FET transconductance amplifier with improved linearity and gain

A field effect transistor amplifier circuit of greater linearity and increase gain, comprising:

• an input amplifier stage comprising a pair of input field effect transistors connected as a common source amplifier stage with their gates connected across a source of input signal voltage and having their sources connected directly together;
• an output amplifier stage comprising a pair of output field effect transistors connected as a common gate amplifier stage with their sources connected to the drains of different ones of said input transistors and their drains connected to provide an output signal current;
• and
• a pair of D.C. current sources, each coupled to the drain of one of said input field effect transistors;
• a correction amplifier stage comprising a pair of compensating field effect transistors connected as a nonlinear common source amplifier stage with their gates connected to the sources of different ones of said output transistors and their drains connected to the drains of the opposite ones of said output transistors to which their gates are connected.