Title :
Negative input resistance and real-time active load-pull measurements of a 2.5GHz oscillator using a LSNA
Author :
Suh, Inwon ; Doo, Seok Joo ; Roblin, Patrick ; Cui, Xian ; Kim, Young Gi ; Strahler, Jeffrey ; Bossche, Marc Vanden ; Rojas, Roberto ; Park, Hyo Dal
Abstract :
A large-signal measurement-based methodology to design oscillators using the Kurokawa theory is presented in this paper. Measurements of the negative input resistance and device line of a 2.5 GHz HEMT oscillator versus frequency and power, and its optimization using real-time active load-pull (RTALP) for the 2nd and 3rd harmonics are performed with a large signal network analyzer (LSNA). As a result, the maximum output power of the oscillator is increased from 31.0 mW to 38.8 mW. Finally self-oscillation is verified using a load tuner to yield an output power and frequency of oscillation in reasonable agreement with the Kurokawa analysis.
Keywords :
UHF oscillators; high electron mobility transistors; negative resistance; HEMT oscillator; HEMT oscillator circuit; Kurokawa theory; LSNA; frequency 2.5 GHz; large signal network analyzer; negative input resistance; real-time active load-pull measurement; self-oscillation; Design methodology; Electrical resistance measurement; Frequency measurement; HEMTs; Harmonic analysis; Oscillators; Performance evaluation; Power generation; Power measurement; Power system harmonics; Real-time Active load-pull; large signal network analyzer (LSNA); negative input resistance; oscillators;
Conference_Titel :
ARFTG Conference, 2007 69th
Conference_Location :
Honolulu, HI
Print_ISBN :
978-0-7803-9762-0
Electronic_ISBN :
978-0-7803-9763-7
DOI :
10.1109/ARFTG.2007.5456350
