[Amps] LDMOS availability

[Mark Bitterlich]

That has already been explained by Manfred.

You may disagree, but that does not make his explanation incorrect.

If the device conducts less than 180 degrees, then it is Class C.  Bias 
modulation does not change the class of amplifier as long as the former 
statement holds true.  The phase linearity of such a design can be difficult 
as was pointed out.  By implementing an error feedback loop to improve the 
linear aspects by a complex modulation of bias does not mean that the class 
of amplifier changes, it just means that linearity improves.

But the bottom line is simply that if the device conducts less than 180 
degrees it is class C.  If any method at all can be used to increase 
linearity this does not change the class of amplifier, it just improves the 
linearity.

This makes sense to me, although it does fly in the face of the conventional 
wisdom drummed into my head decades ago.

Mark Bitterlich
wa3jpy


----- Original Message ----- 
From: "Bill Turner" <dezrat at outlook.com>
To: "Amps group" <amps at contesting.com>
Sent: Friday, June 09, 2017 12:36 PM
Subject: Re: [Amps] LDMOS availability


> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Thu, 8 Jun 2017 21:25:27 -0400, K8RU wrote:
>
>>Class C can be linear,
>
> REPLY:
>
> Please explain how a Class C amp can be linear.
>
> 73, Bill W6WRT
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