IEEE Transactions on Very Large Scale Integration (VLSI) Systems, ( ISI ), Volume (1), No (99), Year (2012-3) , Pages (1-4)

Title : ( A Colpitts CMOS Quadrature VCO Using Direct Connection of Substrates for Coupling )

Authors: Emad Ebrahimi , Sasan Naseh ,

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A new low-phase noise low-power quadrature voltage-controlled oscillator (QVCO) using differential Colpitts oscillator is presented. The proposed QVCO is composed of two identical current-switching differential Colpitts VCOs in which the first core VCO is coupled to the second in an in-phase manner, and the second core VCO is coupled to the first in an anti-phase manner. To couple the two core VCOs, the substrates of the cross-connected transistors as well as the substrates of MOS varactors are used; alleviating the need for any extra elements for coupling, which could add noise and increase power dissipation. A linear (sinusoidal) analysis is presented that confirms that the proposed circuit generates quadrature waveforms. The proposed coupling technique can be generalized to $N$ differential Colpitts VCOs for multiphase signals generation.

Keywords

, Current-switching Colpitts-oscillator , low-phase noise , multiphase , quadrature
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@article{paperid:1029567,
author = {Ebrahimi, Emad and Naseh, Sasan},
title = {A Colpitts CMOS Quadrature VCO Using Direct Connection of Substrates for Coupling},
journal = {IEEE Transactions on Very Large Scale Integration (VLSI) Systems},
year = {2012},
volume = {1},
number = {99},
month = {March},
issn = {1063-8210},
pages = {1--4},
numpages = {3},
keywords = {Current-switching Colpitts-oscillator ; low-phase noise ; multiphase ; quadrature oscillator},
}

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%0 Journal Article
%T A Colpitts CMOS Quadrature VCO Using Direct Connection of Substrates for Coupling
%A Ebrahimi, Emad
%A Naseh, Sasan
%J IEEE Transactions on Very Large Scale Integration (VLSI) Systems
%@ 1063-8210
%D 2012

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