Abstract: A transconductance amplifier has sensfets connected to an H bridge configuration to drive a load with current which is linearly proportional to the input signal. A inverting or a non-inverting side is active depending upon whether the signal is above or below a reference. Three stages include power amplifiers, switches and comparators for turning the two sides on and off. A mirror current source for each sensfet provides feedback to maintain the linearity of the load current as a function of input signal, thus eliminating the need for a resistor in the current path for sensing the feedback.