Just my € 0.02:
A lot of commercial and military users and systems also have stringent
linearity requirements.
One is the output stages of modern mobile telephony base stations and repeaters
for indoor coverage.
Several of the European type acceptance criteria actually require a -70 dB IM3
suppression in a two-tone test at the +40 dBm PEP level.
Some satellite ground stations also require extremely high linearity transmit
chains, as do digital TV transmitters.
Other high-linearity requirements are in co-located radio systems, especially
on small naval platforms.
Here, the total adjacent channel suppression is of importance, which also
includes phase noise and broadband noise,
as well as IM products.
The system planners of really large HF and VHF systems have to take the
linearity properties of both receivers and transmitters into serious
consideration.
73/
Karl-Arne
SM0AOM
----Ursprungligt meddelande----
Från : jtml@losalamos.com
Datum : 2017-05-08 - 09:44 (UTC)
Till : catherine.james@att.net, amps@contesting.com
Ämne : [Amps] HV MOSFETs for RF
Hi Cathy,
For particle accelerator RF systems, we require linearity for some
systems where the envelope of the RF pulse has ramped voltages. This is
needed to capture particles such as ions and protons in a storage ring.
Generally speaking for linear accelerators, linearity is required over a
limited dynamic range, to adjust the RF voltage within 0.5% or less (and
phase must be similarly maintained/locked). This sort of regulation
would be over a few dB of dynamic range, but we typically use linear
amplifiers to simplify things. Power efficiency is not top of the list
of specs.
73
John
K5PRO
> Does anyone outside of ham radio care about modulation modes that require
> excellent linearity?
>
> 73,
> Cathy
> N5WVR
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