| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 101 === The injection-locked oscillators (ILOs) have found their ways in many applications, such as frequency dividers, self-oscillating mixers (SOMs), synchronized amplifier, and spectrum sensing circuits. In the recent years, many researchers have proposed the wireless non-contact vital-sign sensors based on the microwave Doppler radar. As the wireless medical telemetry services (WMTS) are evolving rapidly, the demand for simple, low-power consumption, and small cardiopulmonary monitors are growing accordingly as well. This thesis presents a switching-mode ILO that is based on the class-E operation invented by Sokals in 1975. A switching amplifier and a feedback resonator form the closed-loop for such a circuit to oscillate at a certain desired frequency. The class-E operation benefits the oscillator with higher efficiency than conventional ones. This work is aimed to a noncontact vital-sign sensing system with higher efficiency and lower cost. The last part of this thesis shows the proposed dual tuning voltage Class-E ILO. Based on the proposed architecture, the measured phase noise is -106.71 dBc/Hz at 1-MHz offset from 2.4 GHz, the oscillation frequency can be varied from 2.37 GHz to 2.43 GHz, the measured frequency tuning range is 2.5%.
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