A sawtooth generator adapted to produce a sawtooth voltage, a method of operating the same, and a power converter employing the sawtooth generator and method. In one embodiment, the sawtooth generator includes a current source, coupled to a clock with a clock frequency, configured to produce a reference current proportional to the clock frequency. The sawtooth generator also includes an active network including a switch and a capacitor coupled to the current source and configured to provide a sawtooth voltage with a waveform slope produced across the capacitor substantially proportional to the reference current.