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Issue #208 November 2007
Analog Techniques
NimbleSig
A Compact DDS RF Signal Generator
by Thomas Alldread
Second Prize Luminary Micro DesignStellaris2006 Contest
Start | Design & Hardware | Assembly | Firmware | Calibration | Operating Procedure | Project Complete | Sources & PDF
SOURCES & PDF
Download the PDF of this article.
Author’s Note: A great deal of the credit for the NimbleSig belongs to Dr. James Koehler, Ph.D., who introduced me to surface-mount construction, embedded C, and ARM processors. He spearheaded the design of earlier DDS generators that we mutually developed. Without Jim’s positive influence and generosity, I would not have acquired the knowledge and ability to complete the project. I would also like to thank another good friend, Mr. Graig Pearen, who helped me obtain instrumentation for my lab. Last, but certainly not least, I wish to thank my wife Sylvia who gracefully puts up with my absenteeism while I work on my projects.
Thomas lives with his wife on picturesque Vancouver Island, where he spends most of his time pursuing interests such as designing surface-mount electronics, hobby farming, RVing, digital photography, and amateur radio.
PROJECT FILES
To download code, go to ftp://ftp.circuitcellar.com/pub/Circuit_Cellar/2007/208.
RESOURCES
Analog Devices, Inc., “A Technical Tutorial on Digital Synthesis,” 1999, www.analog.com/UploadedFiles/Tutorials/450968421DDS_Tutorial_rev12-2-99.pdf.
SOURCES
AD8307 Power detector, AD9859 DDS, and AD9951 DDS
Analog Devices, Inc.
www.analog.com
FOX924B TCXO
Fox Electronics
www.foxonline.com
LTspice/SwCAD III Program
Linear Technology Corp.
www.linear.com
LM3S811 Microcontroller
Luminary Micro, Inc.
www.luminarymicro.com
SVCfilter
Tonne Software
www.tonnesoftware.com
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