A HIGH-POWER SOLID-STATE RF SOURCE DRIVEN BY A DOUBLY-DIFFERENTIAL SIGNAL

作者：Jeon Sanggeun^*; Rutledge David B

来源：Microwave and Optical Technology Letters, 2010, 52(7): 1489-1492.

DOI：10.1002/mop.25230

• kW-level RF source
• switching mode
• doubly-differential drive
• high efficiency
• HF band

This letter presents a new solid-state RF source generating kW-level output power at HF band. Four power transistors are driven in a doubly-differential way, operated in a switching mode, and combined together to produce high output power. A multilayered input feed network is carefully designed, such that an accurate doubly-differential signal is provided to the transistors. The output matching and combining circuitry is optimized toward a high efficiency. The implemental RF source produces a CW signal of 1.5 kW at 29 MHz with a drain efficiency of 85%. The measured high efficiency is attributed to the well-balanced and symmetric switching-mode operation of each transistor, which is verified experimentally by a thermal image.

• 出版日期2010-7