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Below are all of the forum threads, including all the responses to the original posts. SDO Post subject: 1700-1900MHz 20w RF amp Posted: Thu Jan 15, 2009 4:55 pm Captain Joined: Tue Aug 26, 2008 5:18 am Posts: 22 Location: UK Hi, can any one advise me which transistors are available for designing 20w, 24-28V balanced RF amp to cover 1.7-1.9GHz band. I am using Microwave Office so it will be nice to have a device whose model is available in MWO like freescale. Thanks. SDO Top IR Post subject: Re: 1700-1900MHz 20w RF ampPosted: Fri Jan 30, 2009 5:10 pm Site Admin Joined: Mon Jun 27, 2005 2:02 pm Posts: 373 Location: Germany Hello SDO, Take a look at Infineon line of RF Power Transistors. http://www.infineon.com/cms/en/product/ ... Power.html From recent experience with them, I know they also have models for MWO. Good lcuk! _________________ Best regards, - IR Top SDO Post subject: Re: 1700-1900MHz 20w RF ampPosted: Thu Feb 19, 2009 6:47 am Captain Joined: Tue Aug 26, 2008 5:18 am Posts: 22 Location: UK Hi IR, Thanks for your reply. I've designed 20W PA (balanced Class A) operating from 1700MHz to 1900MHz using MRF19030 Transistors from Freescale. Regards. SDO Top FSomma Post subject: Re: 1700-1900MHz 20w RF ampPosted: Mon Mar 30, 2009 4:52 pm Hello SDO, Just to add some thoughts to your selection: -The MRF19030 transistor form Freescale might be obsolete or in the way, perhaps you want to take a look to the Freescale 5th or 6th generation LDMOS amplifiers (MRF5... MRF6...) they are more efficient and rough (difficult to burn by a fair output load). Also, you asked for a Class A operation, these Freescale transistors were designed to work as Class AB... I think if you try to make it work into a Class A operation you might end up having a lower P1dB. -A 30W transistor for 20W sound like a good choice from the fact that you will have to use a very broad band match (many match stages---> more insertion loss) to meet the specs from 1.7 to 1.9GHz. -Remember to add a circuit to compensate the bias point drift over temperature, specially if you plan to use it in a high bias point where you will have a lot of heat generation ( I assumed this from the fact that you asked for a class A amp) . Take care Posted 11/12/2012 | ||||||
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