Title : ( A new low-phase noise direct-coupled CMOS LC-QVCO )
Authors: Emad Ebrahimi , Sasan Naseh ,
Full TextAbstract
A new LC quadrature voltage-controlled oscillator (LC-QVCO), made with direct coupling of two CMOS LC-VCOs, is presented. In the proposed circuit two identical cross-connected LC-VCOs are coupled together by directly connecting the bulk of the cross-connected transistors of one VCO to the bulk of the MOS varactors of the other VCO in such a way no extra devices are needed for coupling. Thus, no extra noise sources and power consumption are added to the core VCOs and results in high performance of QVCO. A Linear analysis of the circuit and the result of simulation in a 0.18m CMOS technology are presented. The same proposed coupling scheme can be used for multiphase signal generation as well. Simulation shows the proposed QVCO can operate with supply voltage as low as 0.5 V.
Keywords
, Low-noise, low-power, low-voltage, quadrature LC voltage-controlled oscillators (LC-QVCO), multiphase
@article{paperid:1014314,
author = {Ebrahimi, Emad and Naseh, Sasan},
title = {A new low-phase noise direct-coupled CMOS LC-QVCO},
journal = {IEICE Electronics Express},
year = {2009},
volume = {6},
number = {18},
month = {September},
issn = {1349-2543},
pages = {1337--1344},
numpages = {7},
keywords = {Low-noise; low-power; low-voltage; quadrature LC voltage-controlled oscillators (LC-QVCO); multiphase},
}
%0 Journal Article
%T A new low-phase noise direct-coupled CMOS LC-QVCO
%A Ebrahimi, Emad
%A Naseh, Sasan
%J IEICE Electronics Express
%@ 1349-2543
%D 2009
