Self-biased differential transmitter

A differential output driver comprising:

• a pair of first transistors configured to receive a differential input signal, each of the first transistors having a first safe operating voltage range;
• a pair of output terminals;
• a variable termination resistor coupled between the output terminals;
• and
• a plurality of transistors coupled between the pair of first transistors and output terminals of the differential output driver, the plurality of transistors being configured to receive a supply voltage via the output terminals and reduce a voltage level of the supply voltage for the pair of first transistors, wherein the supply voltage is greater than the first safe operating voltage range;
• wherein the plurality of transistors include a pair of second transistors configured to receive a first intermediate differential output signal from the pair of first transistors and generate a second intermediate differential output signal, each of the second transistors having a second safe operating voltage range different from the first safe operating voltage range;
• and
• wherein the plurality of transistors includes a pair of third transistors configured to receive the second intermediate differential output signal and generate a differential output signal provided to the output terminals.