Design Article
Extend the range of low-power RF devices without exceeding FCC regulations
Thomas Almholt, <br>Worldwide End Equipment Applications Marketing, Texas Instruments
2/15/2010 6:00 AM EST
This article discusses ways to optimize the range of low-power wireless systems while complying with Federal Communications Commission (FCC) regulations on devices classified as general purpose single-channel radios in the unlicensed ISM band (915 MHz or 2.4 GHz). For these devices, the output power of the fundamental frequency shall not exceed –1.25 dBm. It presents the basic considerations in calculating the expected range of wireless links and methods of improving the range. It also covers how to extend the system's range while keeping a focus on low-power and battery-powered applications.
This article is presented as a pdf (no registration required); to read it, click here.
About the Author
Thomas Almholt is senior RF applications engineer for Texas Instruments Low-Power RF group. He has extensive experience as the technical lead for RF system validation of multiple fully-integrated, GSM/EDGE-compliant devices. Thomas received his Master's Degree in RF Systems and Telecommunications engineering from the University of Aalborg in Denmark.
|
|
|
|
|
Navigate to related information
amotsd
3/3/2010 11:42 AM EST
Thomas.
Thank you for the article.
One thing I think needs to be added, is the effect of external filtering.
If there is no filter in front of the external LNA, you will run into IMD and Cross modulation issues.
And with filter you'll have to do the trade off between rejection and insertion loss to optimize Noise figure.
Br
Amots
Sign in to Reply