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We fabricated a novel resonant-tunneling-diode terahertz oscillator with high-frequency modulation structure for high-capacity terahertz communication and measured the frequency response using vector network analyzer. A very high cut-off frequency of 30 GHz in intensity modulation was obtained by the device oscillating at 350 GHz with reduced MIM capacitor of 0.7 pF.
Although the direct-modulation frequency in a resonant-tunneling-diode oscillator increases by reducing the metal-insulator-metal capacitance, the output power degrades simultaneously. We figured out this mechanism using an equivalent circuit model. Based on this result, a novel structure was proposed and fabricated, and terahertz oscillation without degradation in output power was obtained.
In LHD, an ECH system for fusion-relevant plasma heating has been greatly progressed with the development of megawatt gyrotrons. Net power of 3.7 MW could be injected into LHD. For stable operation, a new position and profile monitor of the mmw-beams in evacuated transmission lines is developed.
A tunable power amplifier (PA) from 2.1 GHz to 6.0 GHz is presented for multi-standard radios. The proposed multi-band PA can tune the output impedance to 50 ?? over a wide frequency range, so external isolators following PAs can be eliminated. The PA is implemented by using a 0.18 ??m CMOS process, and the supply voltage is 3.3 V. Over all of the frequency range, the PA realizes output return loss...
A tunable power amplifier (PA) from 0.9 GHz to 3.0 GHz is presented. This paper proposes an output impedance tuning method by using resistive feedback and a parallel resonance consisting of an inductor and a tunable capacitor array. The proposed multi-band PA can adjust the output impedance to 50 ?? over a wide frequency range, so external isolators following PAs can be eliminated. The PA is implemented...
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