[Amps] HV MOSFETs for RF

[sm0aom at telia.com]

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 at losalamos.com
Datum : 2017-05-08 - 09:44 (UTC)
Till : catherine.james at att.net, amps at 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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