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AN-1364
APPLICATION NOTE
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Differential Filter Design for a Receive Chain in Communication Systems
by Mercy Chen
Rev. 0 | Page 1 of 10
INTRODUCTION
RF engineers often see single-ended 50 Ω systems in design.
Some of them feel that the differential circuit is not easy to
design, test, and debug. Meanwhile, for better performance the
differential system is often applied in communication systems
especially in the IF stage. Among those difficulties, a differential
filter is a key concern. This application note looks at some basic
filter key specifications concepts, a few types of frequently used
filter responses, a Chebyshev Type 1 filter application, and
step-by-step instructions on how to transfer a single-ended
filter design to a differential filter design. A differential filter
design example is in this application note as well as a few points
on how to optimize differential circuit PCB design.
