A 10 GHz high-efficiency and low phase-noise negative-resistance oscillator optimized with a virtual loop model

作者：Wang Xiantai; Jin Zhi^*; Wu Danyu; Shen Huajun; Liu Xinyu

来源：Chinese Journal of Semiconductors, 2009, 30(11): 115001.

DOI：10.1088/1674-4926/30/11/115001

• Figure of merit
• High efficiency
• InGaP/GaAs HBT
• Low-phase-noise
• Measurement results
• Oscillator design
• Output power
• Virtual loops

A virtual loop model was built by the transmission analysis with virtual ground method to assist the negative-resistance oscillator design, providing more perspectives on output power and phase-noise optimization. In this work, the virtual loop described the original circuit successfully and the optimizations were effective. A 10 GHz high-efficiency low phase-noise oscillator utilizing an InGaP/GaAs HBT was achieved. The 10.028 GHz oscillator delivered an output power of over 15 dBm with a phase-noise of lower than-107 dBc/Hz at 100 kHz offset. The efficiency of DC to RF transformation was 35%. The results led to a good oscillator figure of merit of-188 dBc/Hz. The measurement results agreed well with those of the simulations.

• 出版日期2009