[Amps] HV MOSFETs for RF

[Mike & Becca Krzystyniak]

Hi Cathy,
   
    NXP/Freescale, and several others have devices in the cellular bands.  Yes, this includes high power devices but I never had the pleasure of using something in the 1.5KW class, mostly restricted by safety limits, ERP limits, and other coverage parameters define the need.  The multimode (LTE/WCDMA/GSM) RF designs I worked with typically were backed of 5-7 dB and some as high as 10 dB Peak to Average Ratio which was part for linearity and overall efficiency.  A number of methods were applied around the designs to maintain adjacent channel products >50 dB down from on channel.  Even in multicarrier cases.  So a 60 watt amp might be running 120 watts average to overcome the losses between the final and the connector, but it was sized for 6-10dB backoff implying at least 600+ watts Peak.   YMMV.
	
73
Mike K9MK/5


    

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Catherine James
Sent: Friday, May 05, 2017 1:07 PM
To: amps at contesting.com; Paul Christensen
Subject: Re: [Amps] HV MOSFETs for RF

What components do they typically use for their final output, high-power devices?  Could hams use the same approach? How do they get around the efficiency and cooling problems we've been discussing?

73,
Cathy
N5WVR

--------------------------------------------
Paul Christensen <w9ac at arrl.net> wrote:

 >"Does anyone outside of ham radio care about modulation modes that require excellent linearity?"
 
 The cellular and broadband/CATV industries to name two.  
 
 Paul, W9AC
 
 
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