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A 1.8 V 900 \mu W 4.5 GHz VCO and Prescaler in 0.18 \mu m CMOS Using Charge-Recycling Technique

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2 Author(s)
Dongmin Park ; Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon ; SeongHwan Cho

This letter presents a charge-recycling VCO and divider in 0.18 mum CMOS technology. The power consumption of the proposed circuit is significantly reduced by stacking the low-voltage divider on the top of the low-voltage VCO, and hence, the VCO reuses the current from the divider. To enhance the reliability of the proposed circuit under supply voltage variation, transistor sharing and adaptive body-biasing techniques are employed. It allows the proposed circuit to operate down to 1.45 V of supply voltage without degrading the FoM. Experimental results show that the proposed circuit achieves 900 muW of power consumption and -184 dBc/Hz of FoM at 1.8 V.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:19 ,  Issue: 2 )