CMOS second-harmonic quadrature voltage controlled oscillator using substrate for coupling

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• 作者：Mohammad Jafar Hemmati (1) mohamad_jafar201@yahoo.com
  Sasan Naseh (1) naseh@um.ac.ir
• 关键词：Common mode node – ; Cross ; connected LC oscillator – ; Phase noise – ; Quadrature oscillator – ; Second ; harmonic – ; Substrate
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：68
• 期：3
• 页码：299-305
• 全文大小：598.0 KB
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• 作者单位：1. The Electrical Engineering Group, Ferdowsi University of Mashhad, Mashhad, Iran
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems
  Electronic and Computer Engineering
  Signal,Image and Speech Processing
  
• 出版者：Springer Netherlands
• ISSN：1573-1979

文摘

In this work, a new circuit configuration for second-harmonic quadrature voltage controlled oscillator (QVCO) with CMOS technology is proposed. The proposed QVCO is made by coupling two identical cross-connected VCOs. The coupling elements (two resistors and two capacitors) do not increase the power consumption of the core VCOs and do not disturb the resonant frequency of the tank circuit in the core VCOs and also, according to the simulations the coupling elements do not adversely affect the phase noise. The role of the substrate terminal of cross-connected MOSFETs of the core oscillators as common mode nodes is demonstrated. Using this node for coupling makes it possible to eliminate the tail transistors in the core oscillators and therefore the circuit can operate with supply voltages as low as 0.5 V. Using the same method to couple more than two core oscillators, results in a multiphase VCO.