NDLI: CMOS active transformers and their applications in voltage-controlled quadrature oscillators

Content Provider	Springer Nature Link
Author	Tang, A. Yuan, F. Law, E.
Copyright Year	2009
Abstract	This paper introduces CMOS active transformers synthesized using MOS transistors only. The proposed active transformers are evolved from their active inductor counterparts and offer a number of attractive characteristics as compared with spiral transformers including a tunable coupling ratio, large and tunable self and mutual inductances, high and tunable quality factors, and a small silicon area consumption. The characteristics of the proposed active transformers including the tunability of the self and mutual inductances, power sensitivity, noise, and quality factor are investigated both analytically and numerically using simulation. The application of the proposed active transformers is exemplified using a 1.6 GHz quadrature VCO implemented in TSMC-0.18 μm 1.8 V CMOS technology and analyzed using SpectreRF from Cadence Design Systems with BSIM3v3 device models. The total transistor area and power consumption of the VCO are 107 μm2 and 10.8 mW, respectively. The phase noise of the VCO is −114.6 dBc/Hz at 1 MHz frequency offset.
Starting Page	83
Ending Page	90
Page Count	8
File Format	PDF
ISSN	09251030
Journal	Analog Integrated Circuits and Signal Processing
Volume Number	62
Issue Number	1
e-ISSN	15731979
Language	English
Publisher	Springer US
Publisher Date	2009-06-03
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CMOS active inductors CMOS active transformers Quadrature oscillators Signal, Image and Speech Processing Electrical Engineering Circuits and Systems
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Signal Processing Hardware and Architecture

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