Joonhong Park, David Kim, Ree Jin Joe, JongWan Jo, Younggun Pu, Kangyoon Lee
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Multi-band PLL for RF wireless charger at 2.4 GHz and 5.8 GHz
This paper presents an integer-N Phase Locked Loop (PLL) for the use in RF wireless charger systems. The presented design supports 4.3 GHz to 6.3 GHz bands using a push-pull Class-C Voltage Controlled Oscillator (VCO) structure. The 2.4 GHz frequency is generated by dividing 4.8 GHz by 2 times to reduce current consumption. Reference spur levels are lower than -45 dBc. The PLL consumes less than 36 mW from a 1.8 V power supply with a settling time less than 40 µs and the area is 1200 µm × 1100 µm in the TSMC 180 nm CMOS process.
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