Voltage amplifying source follower circuit

An amplifying source follower circuit, comprising:

• a source follower FET having a gate and a source;
• a signal voltage applied to said gate for producing a source voltage having a gain with respect to said signal voltage;
• a load connected to said source, said source voltage generating a load current;
• a second FET connected to said source follower FET to sense a change in said source voltage produced by a corresponding change in said signal voltage;
• and
• a third FET connected to said second FET for varying said load current in a direction opposite said sensed source voltage change, thereby driving said source voltage gain to greater than unity.

A method of producing greater than unity gain in a low noise source follower circuit, comprising the steps of:

• providing a source follower FET having a gate and a source connected to a load;
• applying an input voltage to said gate of said source follower FET;
• producing an output voltage at said source of said source follower FET, said output voltage having a gain with respect to said input voltage;
• generating a load current;
• sensing a change in said input voltage;
• and
• varying said load current in a direction opposite said sensed input voltage change, thereby driving said output voltage gain to greater than unity.