To: rsgb_lf_group@blacksheep.org
References: <a980b527-8405-6a80-bb68-2c16dfd191f6@kabelmail.de>
 <CANA3B6VOB+_rvx+3cLSbMP6omfdsbnYWgkagNqRB4WH=De98Gw@mail.gmail.com>
From: DK1IS <DK1IS@kabelmail.de>
Message-ID: <557e2662-716b-f7c5-5714-a355bbe6d238@kabelmail.de>
Date: Tue, 9 Oct 2018 12:40:43 +0200
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Subject: Re: LF: Class E PA
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Hi Riccardo,

thanks for the link - I prefer the most basic version. But like in all=20
other papers I know the problem of the first positive drive pulse after=20
applying the DC power is ignored - perhaps because Class E is mainly=20
discussed for frequencies from MF upwards with correspondent low shunt=20
capacitors. With some hundreds of pF the current peak should be limited=20
by the parasitic impedances but at VLF you get values in the uF range,=20
see attached design sheet from www.TonneSoftware.com. , Version 2.08,=20
describing my plan. Looking at the so far replies I think it would be=20
the best to key the DC voltage synchronously to the next positive drive=20
pulse. In the steady-state condition this topic is no longer relevant,=20
but then the FET could already be dead ;-)

73,
Tom, DK1IS


Am 08.10.2018 um 23:21 schrieb Riccardo Zoli:
>
> Hi Tom,
>
> Which class E configuration did you choose? See the attachment=20
> (extracted from http://www.classeradio.com/rfvalues.htm). Anyway, i=20
> think the shunt capacitor it will be much lower than you expected but=20
> it depends on the number of paralleled MOSFETs (if necessary).
>
> 73 de Riccardo IW4DXW
>
>
>
> Il Dom 7 Ott 2018, 19:52 DK1IS <DK1IS@kabelmail.de=20
> <mailto:DK1IS@kabelmail.de>> ha scritto:
>
>     Hello Group,
>
>     Planning a new single-ended Class E PA for my activities on the
>     Dreamers Band (8.27 kHz) two questions came up - perhaps someone
>     can help me:
>
>     -=C2=A0 Being interested only in on-off-keying I=C2=B4m concerned a=
bout the
>     capacitor in parallel to the power FET which in my case on VLF
>     will be in the uF range. If the DC supply is on and without gate
>     drive this capacitor is charged to the DC supply voltage. At the
>     first positive gate pulse it discharges via the drain-source-path,
>     the current being limited only by parasitc impedances - a poorly
>     defined condition which usually has to be avoided. Does this mean
>     that I have to apply drive continously and key the DC power supply
>     only, perhaps synchronously to the next positive drive pulse?
>
>     - Is there any rule of thumb for the inductance of the rf choke in
>     the drain-power supply path?
>
>     Thanks for any idea!
>
>     73,
>     Tom, DK1IS
>     www.qrz.com/db/dk1is <http://www.qrz.com/db/dk1is>
>


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<html>
  <head>
    <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf=
-8">
  </head>
  <body text=3D"#000000" bgcolor=3D"#FFFFFF">
    <div class=3D"moz-cite-prefix">Hi Riccardo,<br>
      <br>
      thanks for the link - I prefer the most basic version. But like in
      all other papers I know the problem of the first positive drive
      pulse after applying the DC power is ignored - perhaps because
      Class E is mainly discussed for frequencies from MF upwards with
      correspondent low shunt capacitors. With some hundreds of pF the
      current peak should be limited by the parasitic impedances but at
      VLF you get values in the uF range, see attached design sheet from
      <a class=3D"moz-txt-link-abbreviated" href=3D"http://www.TonneSoftw=
are.com">www.TonneSoftware.com</a>. , Version 2.08, describing my plan. L=
ooking
      at the so far replies I think it would be the best to key the DC
      voltage synchronously to the next positive drive pulse. In the
      steady-state condition this topic is no longer relevant, but then
      the FET could already be dead ;-)<br>
      <br>
      73,<br>
      Tom, DK1IS<br>
      <br>
      <br>
      Am 08.10.2018 um 23:21 schrieb Riccardo Zoli:<br>
    </div>
    <blockquote type=3D"cite"
cite=3D"mid:CANA3B6VOB+_rvx+3cLSbMP6omfdsbnYWgkagNqRB4WH=3DDe98Gw@mail.gm=
ail.com">
      <meta http-equiv=3D"content-type" content=3D"text/html; charset=3Du=
tf-8">
      <div dir=3D"auto">
        <div dir=3D"auto"><br>
        </div>
        <div dir=3D"auto">Hi Tom,</div>
        <div dir=3D"auto"><br>
        </div>
        <div dir=3D"auto">Which class E configuration did you choose? See
          the attachment (extracted from <a
            href=3D"http://www.classeradio.com/rfvalues.htm"
            target=3D"_blank" rel=3D"noreferrer" moz-do-not-send=3D"true"=
>http://www.classeradio.com/rfvalues.htm</a>).
          Anyway, i think the shunt capacitor it will be much lower than
          you expected but it depends on the number of paralleled
          MOSFETs (if necessary).</div>
        <div dir=3D"auto"><br>
        </div>
        <div dir=3D"auto">73 de Riccardo IW4DXW</div>
        <div dir=3D"auto"><br>
        </div>
        <br>
        <br>
        <div class=3D"gmail_quote" dir=3D"auto">
          <div dir=3D"ltr">Il Dom 7 Ott 2018, 19:52 DK1IS &lt;<a
              href=3D"mailto:DK1IS@kabelmail.de" rel=3D"noreferrer
              noreferrer" target=3D"_blank" moz-do-not-send=3D"true">DK1I=
S@kabelmail.de</a>&gt;
            ha scritto:<br>
          </div>
          <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div text=3D"#000000" bgcolor=3D"#FFFFFF">
              <p> </p>
              <p class=3D"MsoNormal"><span lang=3D"EN-US">Hello Group,</s=
pan></p>
              <p class=3D"MsoNormal"><span lang=3D"EN-US">Planning a new
                  single-ended Class E PA for my activities on the
                  Dreamers Band (8.27 kHz) two questions came up -
                  perhaps someone can help me:</span></p>
              <span style=3D"font-family:Symbol" lang=3D"EN-US"><span><sp=
an
                    style=3D"font:7.0pt &quot;Times New Roman&quot;"></sp=
an></span></span><span
                lang=3D"EN-US">-=C2=A0 Being interested only in on-off-ke=
ying
                I=C2=B4m concerned about the capacitor in parallel to the
                power FET which in my case on VLF will be in the uF
                range. If the DC supply is on and without gate drive
                this capacitor is charged to the DC supply voltage. At
                the first positive gate pulse it discharges via the
                drain-source-path, the current being <span>=C2=A0</span>l=
imited
                only by parasitc impedances - a poorly defined condition
                which usually has to be avoided. Does this mean that I
                have to apply drive continously and key the DC power
                supply only, perhaps synchronously to the next positive
                drive pulse?</span><br>
              =C2=A0 <span style=3D"font-family:Symbol" lang=3D"EN-US"><s=
pan><br>
                  -=C2=A0 <span style=3D"font:7.0pt &quot;Times New
                    Roman&quot;"></span></span></span><span lang=3D"EN-US=
">Is
                there any rule of thumb for the inductance of the rf
                choke in the drain-power supply path?</span>
              <p> </p>
              <p class=3D"MsoNormal"><span lang=3D"EN-US">Thanks for any
                  idea!</span></p>
              <p class=3D"MsoNormal"><span lang=3D"EN-US">73,<br>
                  Tom, DK1IS<br>
                  <a
class=3D"m_1379083177787121856m_4603438758728675400m_1001267268829226190m=
oz-txt-link-abbreviated"
                    href=3D"http://www.qrz.com/db/dk1is" rel=3D"noreferre=
r
                    noreferrer noreferrer" target=3D"_blank"
                    moz-do-not-send=3D"true">www.qrz.com/db/dk1is</a><br>
                </span></p>
            </div>
          </blockquote>
        </div>
      </div>
    </blockquote>
    <p><br>
    </p>
  </body>
</html>

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