NDLI: A wideband quadrature generator IC using a varactor-compensated feedback network

Content Provider	Springer Nature Link
Author	Yong, Gideon S. K. Saavedra, Carlos E.
Copyright Year	2009
Abstract	In this paper a novel quadrature generator is presented that exhibits a 110% operating frequency bandwidth. Existing circuits are unable to provide a quadrature signal over such a large fractional bandwidth. They are also highly susceptible to component tolerances that can often shift the center operating frequency rendering the circuit unusable. In this work, this issue is mitigated with the use of a negative feedback network that is able to actively compensate the circuit using varactors to match the operating frequency. In this manner, the bandwidth of the quadrature generator can be significantly increased. Simulation results show an operating frequency span from 1 to 6 GHz while maintaining a phase error below 5° and ±2 dB in amplitude error. The circuit, without bonding pads, uses an area of only 0.17 mm2.
Starting Page	161
Ending Page	167
Page Count	7
File Format	PDF
ISSN	09251030
Journal	Analog Integrated Circuits and Signal Processing
Volume Number	63
Issue Number	2
e-ISSN	15731979
Language	English
Publisher	Springer US
Publisher Date	2009-10-20
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quadrature generator Feedback Varactor Wideband RF 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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A wideband quadrature generator IC using a varactor-compensated feedback network