A ballast for an electrodeless high intensity discharge lamp comprises a Class-D power amplifier including an integrated tuning capacitor network and heat sink. A series blocking/tuning capacitor and a parallel tuning capacitor are integrated by sharing a common capacitor plate. The metal plates of the...http://www.google.ca/patents/US5047692?utm_source=gb-gplus-sharePatent US5047692 - Integrated tuning capacitor network and heat sink for an electrodeless high intensity discharge lamp ballast
