1. A driver comprising: a voltage source; a current source with one end coupled to ground; two differential current steering transistor legs to drive a signal, each leg including at least two transistors coupled in series, one end of each leg coupled to the voltage source and the other end of each leg coupled to the current source, the output for each leg is measured where the two transistors intersect; and a voltage amplifier to compare the common-mode voltage at the output of the two differential current steering transistor legs to a target common-mode voltage, the amplifier to provide a feedback output voltage to adjust the common-mode voltage to the level of the target common-mode voltage.