A switching circuit includes a first diode coupled between a first terminal and a second terminal, a second diode coupled between the first terminal and a third terminal, and a bias circuit coupled to the first terminal and configured to bias the first diode on and the second diode off in a first switch state and to bias the first diode off and the second diode on in a second switch state, the bias circuit including a voltage converter configured to convert a fixed voltage to an intermediate voltage and a current source coupled in series with the voltage converter.