| Item | Contents |
|---|---|
| Voltage variable attenuator (VVA) | Attenuate RF signals in the frequency range of interest by varying the voltage (applying a device with a gain variable range of ≥5 dB) Control the HPA output power level by adjusting the RF input power level to the HPA |
| High power amplifier (HPA) | Amplify RF signals to high power Utilize an 80 W-class MMIC HPA operating within Class A or AB linear regions to support algorithm execution |
| RF detector | Convert RF signals into voltage Fabricate to have a minimal output power deviation (≤1 dB) for the same voltage output within the frequency range of interest |
| Temperature sensor | Sense temperature and convert it into voltage Measure the HPA temperature (−40°C to +125°C) by locating it in close proximity to the HPA |
| Analog to digital converter (ADC) | Convert analog voltage into digital values Convert the voltage corresponding to the RF output power into a digital value and input it to the controller (applying a 14-bit class, 250 MHz sampling rate) |
| Digital analog converter (DAC) | Convert digital values into analog voltage Convert the digital values derived by the algorithm proposed in this paper into VVA control voltages (applying a 10-bit class, settling time ≤100 us) |