A differential amplifier includes a first diode having a first terminal and a second terminal wherein the first terminal is coupled to a voltage node and the second terminal is coupled to a first node, a second diode having a first terminal and a second terminal wherein the first terminal of the second diode is coupled to the voltage node and the second terminal of the second diode is coupled to a second node, a first transistor coupled to the first node in series with the first diode and having a control terminal coupled to a first input terminal, a second transistor coupled to the second node in series with the second diode and having a control terminal coupled to a second input terminal, and a bias current supply coupled to the first and second nodes to bias the first and second diodes.