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From: Andy Talbot <andy.g4jnt@gmail.com>
Date: Fri, 30 Mar 2018 00:33:00 +0100
Message-ID: <CAA8k23R=ts8kp9mDk-OfmvC8CGUB-NmirYz2VS1f_O=6kf5SLQ@mail.gmail.com>
To: LineOne <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Pout vs V for class D amp?
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Take a look at http://www.g4jnt.com/137tx.pdf
All the equations you need are in there

and "single ended" in that context refers to class A / B   not E
Class E is a special (quasi resonant) type of switching transmitter

Andy


On 29 March 2018 at 23:18, N1BUG <paul@n1bug.com> wrote:

> Some months back, Andy gave me this formula for calculating power
> out of a single ended (class E) PA. It has been very helpful.
>
> Pout max = Vdd ^2 / 2 / RL
>
> Is there a similar formula to calculate power out of a class D
> voltage mode PA (such as the W1VD design)?
>
> I'm almost finished building my W1VD PA and I am wondering what
> power output I can expect at different power supply voltages. I need
> to make some sensible decisions about power supplies...
>
> Thanks,
> Paul N1BUG
>
>

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<div dir=3D"ltr">Take a look at=C2=A0<a href=3D"http://www.g4jnt.com/137tx.=
pdf">http://www.g4jnt.com/137tx.pdf</a><div>All the equations you need are =
in there</div><div><br></div><div>and &quot;single ended&quot; in that cont=
ext refers to class A / B=C2=A0 =C2=A0not E</div><div>Class E is a special =
(quasi resonant) type of switching transmitter</div><div><br></div><div>And=
y</div><div><br></div><div><br></div><div><br></div></div><div class=3D"gma=
il_extra"><br><div class=3D"gmail_quote">On 29 March 2018 at 23:18, N1BUG <=
span dir=3D"ltr">&lt;<a href=3D"mailto:paul@n1bug.com" target=3D"_blank">pa=
ul@n1bug.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Some m=
onths back, Andy gave me this formula for calculating power<br>
out of a single ended (class E) PA. It has been very helpful.<br>
<br>
Pout max =3D Vdd ^2 / 2 / RL<br>
<br>
Is there a similar formula to calculate power out of a class D<br>
voltage mode PA (such as the W1VD design)?<br>
<br>
I&#39;m almost finished building my W1VD PA and I am wondering what<br>
power output I can expect at different power supply voltages. I need<br>
to make some sensible decisions about power supplies...<br>
<br>
Thanks,<br>
Paul N1BUG<br>
<br>
</blockquote></div><br></div>

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