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A one-pin crystal oscillator (XO) employing a one-pin startup and self-charged architecture is proposed to reduce power consumption. The self-charged circuit, replacing a constant-current opamp, recharges crystal to save significant power. 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.
References
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1. Santos, J.T., Meyer, R.G.: ‘A one-pin crystal oscillator for VLSI circuits’, IEEE J. Solid-State Circuits, 1984, 19, (2), pp. 228–236, (doi: 10.1109/JSSC.1984.1052122).
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2. van den Homberg, J.A.T.M.: ‘A universal 0.03 mm2 one-pin crystal oscillator in CMOS’, IEEE J. Solid-State Circuits, 1999, 34, (7), pp. 956–961, (doi: 10.1109/4.772410).
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3. Hsiao, K.-J.: ‘A 1.89 nW/0.15 V self-charged XO for real-time clock generation’. ISSCC Dig. Tech. Pap., San Francisco, CA, USA, February 2014, pp. 298–299, .
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in brief
Ultra-low-power one-pin crystal oscillator with self-charged technique