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A CMOS voltage-controlled oscillator using high-Q on-chip inductor implemented in a wafer-level package

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3 Author(s)
Sang-Woong Yoon ; Georgia Electron. Design Center, Georgia Inst. of Technol., Atlanta, GA, USA ; Pinel, S. ; Laskar, J.

This paper presents a CMOS voltage-controlled oscillator (VCO) with a high-Q inductor in a wafer-level package for the LC-resonator. The on-chip inductor is implemented using the redistribution metal layer of the WLP, and therefore it is called a WLP inductor. Using the thick passivation and copper metallization, the WLP inductor has high quality-factor (Q-factor). A 2nH inductor exhibits a Q-factor of 8 at 2 GHz. The center frequency of the VCO is 2.16 GHz with a tuning range of 385 MHz (18 %). The minimum phase noise is measured to be -120.2 dBc/Hz at an offset frequency of 600 KHz. The DC power consumed by the VCO-core is 1.87 mW with a supply voltage of 1.7 V and a current of 1.1 mA. The output power with a 50 Q load is -12.5 ± 1.3 dBm throughout the whole tuning range. From the best of our knowledge, compared with recently published 2 GHz-band 0.35 μm CMOS VCOs in the literature, the VCO in this work shows the lowest power consumption and the best FOM.

Published in:

Microwave Symposium Digest, 2005 IEEE MTT-S International

Date of Conference:

12-17 June 2005

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