Patent ID: 7602228

Claim:
A circuit comprising: a first normally-on switch having a source, a drain and a gate, the source of the first normally-on switch electrically connected to a load and the drain of the first normally-on switch electrically connected to a supply voltage; a second normally-on switch having a source, a drain, and a gate, the source of the second normally-on switch electrically connected to a common voltage and the drain of the second normally-on switch electrically connected to the load; a first gate driver electrically connected between the gate and the source of the first normally-on switch; a second gate driver electrically connected between the gate and the source of the second normally-on switch; and a first oscillating power supply electrically connected in parallel across the drain and the source of the first normally-on switch, the first oscillating power supply configured to power the first gate driver such that, for a given voltage applied to the input to the first oscillating power supply, the first oscillating power supply generates an output voltage which is supplied to the gate of the first normally-on switch by the first gate driver; a second oscillating power supply electrically connected in parallel across the drain and the source of the second normally-on switch, the second oscillating power supply configured to power the second gate driver such that, for a given voltage applied to the input to the second oscillating power supply, the second oscillating power supply generates an output voltage which is supplied to the gate of the second normally-on switch by the second gate driver.