Power amplifiers Controllers 4 Energy efficiency 3 Power control 3 Back telemetry 2 Control unit 2 Controller hardware 2 Controller hardware-in-the-loop simulation 2 Cost effectiveness 2 DSO 2 DSOs 2 Digital controllers 2 Digital power controller 2 Energy management 2 Energy management systems 2 Equipment testing 2 Field programmable gate arrays (FPGA) 2 Global system for mo-bile communication 2 Global systems 2 Hardware-in-the-loop simulation 2 Hardwarein-the-loop simulations (HIL) 2 Implantable medical devices 2 Implants (surgical) 2 Low voltage distribution network 2 Low-voltage networks 2 Natural resources 2 Ophthalmology 2 Power 2 Power controllers 2 Power efficient 2