In one embodiment, a secondary-side controller is configured to detect a burst-mode of operation and responsively block or prevent sending drive pulses to a power transistor that is coupled in the secondary side. The system includes a controlled system coupled to a tuned run-to-run controller, which contains a feedback controller coupled to a tuner. A dummy mask is formed in a bent portion of the second sacrificial layer between the adjacent spacers. In one embodiment, the frequency doubler circuit is operable to receive a first frequency signal for generating a second frequency signal and also receiving the reference current.