In some examples, an apparatus includes a driver having a driver output, a capacitor having a first plate and a second plate, the first plate coupled to the driver output, and a transistor having a transistor gate, a transistor source, and a transistor drain. The apparatus also includes a first switch coupled between the second plate and the transistor gate, a second switch coupled between the second plate and the transistor drain, and a third switch coupled between the transistor gate and the transistor drain.