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Special Section on Analog Circuits and Related SoC Integration Technologies

A Wide-Tunable LC-Based Voltage-Controlled Oscillator Using a Divide-by-N Injection-Locked Frequency Divider

Shoichi HARA, Kenichi OKADA, Akira MATSUZAWA

Author information

Shoichi HARA
Department of Physical Electronics, Tokyo Institute of Technology
Kenichi OKADA
Department of Physical Electronics, Tokyo Institute of Technology
Akira MATSUZAWA
Department of Physical Electronics, Tokyo Institute of Technology

Corresponding author

Keywords:CMOS,VCO,divider,inductor

JOURNALRESTRICTED ACCESS

2010 Volume E93.CIssue 6Pages 763-769

DOIhttps://doi.org/10.1587/transele.E93.C.763

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Published: June 01, 2010Received: October 15, 2009Available on J-STAGE: June 01, 2010Accepted: -Advance online publication: -Revised: -

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Article overview

Abstract

This paper proposes a novel wideband voltage-controlled oscillator (VCO) for multi-band transceivers. The proposed oscillator has a core VCO and a tuning-range extension circuit, which consists of an injection-locked frequency divider (ILFD) and flip flop dividers. The two-stage differential ILFD generates quadrature outputs and realizes two, three, four, and six of divide ratio with very wide output frequency range. The proposed circuit is implemented by using a 90nm CMOS process, and the chip area is 250 × 200µm². The measured result achieves continuous frequency tuning range of 9.3MHz-to-5.7GHz (199%) with −210dBc/Hz of figure-of-merit (FoM_T).

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