Global Sources
EE Times-India
Stay in touch with EE Times India
 
EE Times-India > Amplifiers/Converters
 
 
Amplifiers/Converters  

DVB-T power amp with RF transistor

Posted: 20 Dec 2010     Print Version  Bookmark and Share

Keywords:BLF881  RF transistor  fractional bandwidth 

This application note describes the design and performance of a 50 W DVB-T power amplifier for the 174 MHz to 230 MHz VHF band using the BLF881 power transistor. In particular, it compares the DVB-T performance for flat gain with best ACPR tuning.

The BLF881 is a 50 V high power RF transistor based on NXP Semiconductor's high voltage LDMOS process. It is designed for use in the 470 MHz to 860 MHz UHF broadcast band, where it can deliver 140 W (peak sync) for analog TV and 33 W for DVB-T (8K).

When using the BLF881 in the VHF band, special attention is needed to achieve a broadband input match due to the high Q (6 at 174 MHz) at these lower input frequencies. With care, an input return loss better than 6 dB can be achieved across the 28 % fractional bandwidth.

View the PDF document for more information.





Comment on "DVB-T power amp with RF transistor"
Comments:  
*  You can enter [0] more charecters.
*Verify code:
 
 
Webinars

Seminars

Visit Asia Webinars to learn about the latest in technology and get practical design tips.

 

Go to top             Connect on Facebook      Follow us on Twitter      Follow us on Orkut

 
Back to Top