| Summary: | 碩士 === 國立臺灣大學 === 電子工程學研究所 === 103 === An ultra-low power one-pin crystal oscillator (XO), employing a one-pin startup and self-charged architecture, is proposed to reduce power consumption. The self-charge circuit, replacing a constant-current op amp, recharges crystal adaptively. It composed of start-up circuit, edge extractor and pulse booster. Self-charge method reuses crystal output sine wave to compensate for internal energy loss in crystal. The proposed 32.768-kHz one-pin XO, fabricated in a 0.18-μm CMOS technology, consumes 2.89 nW from a 0.25-V supply and the active area is 0.027 mm2.
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