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A 0.5-V 0.4–2.24-GHz Inductorless Phase-Locked Loop in a System-on-Chip

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4 Author(s)
Kuo-Hsing Cheng ; Dept. of Electr. Eng., Nat. Central Univ., Jhongli, Taiwan ; Yu-Chang Tsai ; Yu-Lung Lo ; Jing-Shiuan Huang

A phase-locked loop (PLL) is proposed for low-voltage applications. A new charge pump (CP) circuit, using gate switches affords low leakage current and high speed operation. A low-voltage voltage-controlled oscillator (LV-VCO) composed of 4-stage delay cells and a low-voltage segmented current mirror (LV-SCM) achieves low voltage-controlled oscillator gain (KVCO), a wide tuning range, and good linearity. A LV-SCM generates more current with small area by switching the body rather than the gate. The PLL is implemented in standard 90-nm CMOS with regular VT (RVT) devices. Its output jitter is 2.22 ps (rms), which is less than 0.5% of the output period. The phase noise is - 87 dBc/Hz at 1-MHz offset from a 2.24-GHz center frequency. Total power dissipation at 2.24-GHz output frequency, and with 0.5-V power supply is 2.08 mW (excluding the buffers). The core area is 0.074 mm2.

Published in:

Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:58 ,  Issue: 5 )

Date of Publication:

May 2011

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