Fig. 1. Block diagram of load mismatch measurement system

Fig. 2. Photograph of real-time load pull measurement system

Fig. 3. Parasitic model and comparison about deembedding

Fig. 4. Power sweep under optimal load impedance

Fig. 5. Locations of impedance point for ruggedness test

Fig. 6. Characteristic of HBT under 2nd harmonic load mismatch

Fig. 7. RF I-V characteristic of HBT under fundamental load mismatch

Fig. 8. DLLs of fundamental and 2nd harmonic ruggedness