1. A CMOS quadrature voltage‐controlled oscillators using common‐drain coupling transistors
- Author
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Chia-Wei Chang, Miin-Horng Juang, You-Wei Liu, and Sheng-Lyang Jang
- Subjects
Engineering ,Common drain ,business.industry ,Transistor ,Electrical engineering ,dBc ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Voltage-controlled oscillator ,CMOS ,law ,Phase noise ,Figure of merit ,Electrical and Electronic Engineering ,business ,NMOS logic - Abstract
This article presents a fully integrated quadrature cross-coupled voltage controlled oscillator (QVCO) using common-drain transistor instead of common-source transistor as a coupling device.The prototype 3.8 GHz QVCO in 0.18 μm CMOS process is proposed to generate four output phases and it uses two p-core cross-coupled VCOs and nMOS coupling devices. The proposed QVCO oscillates from 3.6 to 3.84 GHz and the power consumption is 7.24 mW at 0.74 V supply voltage. The measured phase noise is –126.19 dBc/Hz at 1 MHz offset frequency from the carrier frequency 3.745 GHz. The VCO occupies a chip area of 1.08 ×0.924 mm2 and provides a figure of merit of –189.05 dBc/Hz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1262–1266, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27578
- Published
- 2013
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