1. An electrical circuit, comprising: a first FET that partially controls output voltage signals responsive to an input voltage; a gate load coupled to a gate of the first FET; a drain load coupled to a drain of the first FET; a source load coupled to a source of the first FET; a controllable variable current generator providing a current to the source of the first FET, biasing the source of the first FET to a reference voltage; and a first input conductor coupled to the gate of the first FET and an input voltage signal including a variable input signal applied to the first input conductor.