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@contesting.com] On Behalf Of Catherine James
Sent: Friday, May 05, 2017 1:07 PM
To: amps@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@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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