Various aspects of the disclosure provide low index metamaterials. The circuit configuration has a circuit for level boosting and also a logic circuit. Additionally, the VCO includes a plurality of switching circuits, each of the plurality of switching circuits being configured to selectively enable or disable a corresponding one of the plurality of current sources in response to a corresponding one of the plurality of compensation control signals. Power of at least one network component connected in the low-voltage network is reduced when a power shortfall occurs in the high-voltage network while the high-voltage battery is being charged. In an example embodiment, a sealing groove is defined in the outer shroud for receiving the aft resilient seal. Both bag-on-valve and metered dose packages are disclosed.