Notes. (a) Designs in [1, 2, 10], based on commercially available IC modules; (b) comprehensive listing of recent APFs using various ABBs presented in .
We are committed to sharing findings related to COVID-19 as quickly and safely as possible. Any author submitting a COVID-19 paper should notify us at email@example.com to ensure their research is fast-tracked and made available on a preprint server as soon as possible. We will be providing unlimited waivers of publication charges for accepted articles related to COVID-19.