IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
Source-injection serial coupled CMOS LC quadrature VCO
Abumoslem JannesariMahmoud Kamarei
Author information
JOURNAL FREE ACCESS

2007 Volume 4 Issue 14 Pages 467-471

Details
Abstract

A novel source-injection serial-coupled (SISC) topology for designing LC quadrature voltage-controlled-oscillator (QVCO) is proposed. The proposed topology uses the advantages of the cascode-coupling QVCO and source-injection parallel-coupled (SIPC) QVCO topologies and provides a good phase noise performance with good quadrature phase accuracy. A 1.8GHz, 1.8v designed QVCO based on this topology shows a phase noise of -136dBc/Hz at 1MHz offset frequency thereby showing 5dB and 7.3dB lower phase noise than the SIPC and the cascode-coupling topologies respectively. This result is obtained from the simulation based on 0.18u CMOS technology and on-chip spiral inductor with Q of 8.

Content from these authors
© 2007 by The Institute of Electronics, Information and Communication Engineers
Previous article
feedback
Top