Reply by Simon S Aysdie●February 8, 20232023-02-08
On Tuesday, February 7, 2023 at 7:46:18 PM UTC-8, John Larkin wrote:
> On Mon, 06 Feb 2023 09:47:57 -0800, John Larkin
> <jla...@highlandSNIPMEtechnology.com> wrote:
>
> >
> >https://www.qorvo.com/products/p/QPD1016
> >
> >The part could be very useful in wideband/pulse applications [1] but
> >there are no DC curves, no capacitances, no Spice models, just the
> >silly load pull cartoons.
> >
> >[1] except for the price of course.
> Qorvo confirms that there are no DC curves nor a Spice model.
Supposing you do manage to figure it out, chances are that Qorvo will then EOL it. lol
Reply by legg●February 8, 20232023-02-08
On Mon, 06 Feb 2023 09:47:57 -0800, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:
>
>https://www.qorvo.com/products/p/QPD1016
>
>The part could be very useful in wideband/pulse applications [1] but
>there are no DC curves, no capacitances, no Spice models, just the
>silly load pull cartoons.
>
>[1] except for the price of course.
Odd to publish surface temp rise data above 200C for a part
that is epoxy-sealed.
RL
Reply by John Larkin●February 7, 20232023-02-07
On Mon, 06 Feb 2023 09:47:57 -0800, John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote:
>
>https://www.qorvo.com/products/p/QPD1016
>
>The part could be very useful in wideband/pulse applications [1] but
>there are no DC curves, no capacitances, no Spice models, just the
>silly load pull cartoons.
>
>[1] except for the price of course.
Qorvo confirms that there are no DC curves nor a Spice model.
Reply by John Larkin●February 7, 20232023-02-07
On Tue, 7 Feb 2023 17:04:15 +0100, Gerhard Hoffmann <dk4xp@arcor.de>
wrote:
>Am 07.02.23 um 16:47 schrieb John Larkin:
>> On Tue, 07 Feb 2023 07:01:57 GMT, Jan Panteltje <alien@comet.invalid>
>> wrote:
>>
>>> On a sunny day (Mon, 06 Feb 2023 09:47:57 -0800) it happened John Larkin
>>> <jlarkin@highlandSNIPMEtechnology.com> wrote in
>>> <7qe2uh9mv99o5pt91in5j1j9b4drqqirrg@4ax.com>:
>>>
>>>>
>>>> https://www.qorvo.com/products/p/QPD1016
>>>>
>>>> The part could be very useful in wideband/pulse applications [1] but
>>>> there are no DC curves, no capacitances, no Spice models, just the
>>>> silly load pull cartoons.
>>>>
>>>> [1] except for the price of course.
>>>>
>>>
>>> Bit puzzled by the bias on - bias off sequence for the test board...
>>> page 20 pfd
>>> How critical is that?
>>> Needs some external circuits..
>>
>> It's fiddle-biased. One needs to be careful to not blow it up.
>> Envision blowing up a lot of parts on the test fixture, at $1K each.
>>
>> It's interesting that Id-max is 70 amps but they set the current
>> limited supply to 1.1.
>>
>> In a real amp, presumably there would be a servo loop to sense Id and
>> set the gate bias voltage, and sequence everything properly. A Spice
>> model would be the way to develop that!
>>
>> I wonder if the gate is a diode to the source, and how that behaves.
>> Presumably it is a depletion fet. Idss is of course not a measurement
>> that the RF types don't understand.
>>
>> The EPC GaN fets are great and they have Spice models that mostly
>> work. Their gate behavior is interesting.
>>
>> I use the SAV-5xx parts in time domain, as switches, and they have at
>> least some DC curves on their data sheets; I've measured more.
>> MiniCircuits promises to never offer a Spice model.
>>
>> "The easiest thing in the world is not to sell."
>>
>> - Melvin Goldstein
>>
>
>< https://www.modelithics.com/MVP/Qorvo?comp_id=Qorvo&tab=3 >
>
>
>
>< https://www.qorvo.com/products/p/QPD1016#documents >
>
>< https://www.qorvo.com/products/p/QPD1016#evaluation-tools >
>
>cheers, Gerhard
>
Free trial?
Do they have a Spice model? I see nonlinear RF models that need a
suite of expensive RF sim stuff.
I emailed them about a Spice model.
Reply by Gerhard Hoffmann●February 7, 20232023-02-07
Am 07.02.23 um 16:47 schrieb John Larkin:
> On Tue, 07 Feb 2023 07:01:57 GMT, Jan Panteltje <alien@comet.invalid>
> wrote:
>
>> On a sunny day (Mon, 06 Feb 2023 09:47:57 -0800) it happened John Larkin
>> <jlarkin@highlandSNIPMEtechnology.com> wrote in
>> <7qe2uh9mv99o5pt91in5j1j9b4drqqirrg@4ax.com>:
>>
>>>
>>> https://www.qorvo.com/products/p/QPD1016
>>>
>>> The part could be very useful in wideband/pulse applications [1] but
>>> there are no DC curves, no capacitances, no Spice models, just the
>>> silly load pull cartoons.
>>>
>>> [1] except for the price of course.
>>>
>>
>> Bit puzzled by the bias on - bias off sequence for the test board...
>> page 20 pfd
>> How critical is that?
>> Needs some external circuits..
>
> It's fiddle-biased. One needs to be careful to not blow it up.
> Envision blowing up a lot of parts on the test fixture, at $1K each.
>
> It's interesting that Id-max is 70 amps but they set the current
> limited supply to 1.1.
>
> In a real amp, presumably there would be a servo loop to sense Id and
> set the gate bias voltage, and sequence everything properly. A Spice
> model would be the way to develop that!
>
> I wonder if the gate is a diode to the source, and how that behaves.
> Presumably it is a depletion fet. Idss is of course not a measurement
> that the RF types don't understand.
>
> The EPC GaN fets are great and they have Spice models that mostly
> work. Their gate behavior is interesting.
>
> I use the SAV-5xx parts in time domain, as switches, and they have at
> least some DC curves on their data sheets; I've measured more.
> MiniCircuits promises to never offer a Spice model.
>
> "The easiest thing in the world is not to sell."
>
> - Melvin Goldstein
>
On Tue, 07 Feb 2023 07:01:57 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
>On a sunny day (Mon, 06 Feb 2023 09:47:57 -0800) it happened John Larkin
><jlarkin@highlandSNIPMEtechnology.com> wrote in
><7qe2uh9mv99o5pt91in5j1j9b4drqqirrg@4ax.com>:
>
>>
>>https://www.qorvo.com/products/p/QPD1016
>>
>>The part could be very useful in wideband/pulse applications [1] but
>>there are no DC curves, no capacitances, no Spice models, just the
>>silly load pull cartoons.
>>
>>[1] except for the price of course.
>>
>
>Bit puzzled by the bias on - bias off sequence for the test board...
>page 20 pfd
>How critical is that?
>Needs some external circuits..
It's fiddle-biased. One needs to be careful to not blow it up.
Envision blowing up a lot of parts on the test fixture, at $1K each.
It's interesting that Id-max is 70 amps but they set the current
limited supply to 1.1.
In a real amp, presumably there would be a servo loop to sense Id and
set the gate bias voltage, and sequence everything properly. A Spice
model would be the way to develop that!
I wonder if the gate is a diode to the source, and how that behaves.
Presumably it is a depletion fet. Idss is of course not a measurement
that the RF types don't understand.
The EPC GaN fets are great and they have Spice models that mostly
work. Their gate behavior is interesting.
I use the SAV-5xx parts in time domain, as switches, and they have at
least some DC curves on their data sheets; I've measured more.
MiniCircuits promises to never offer a Spice model.
"The easiest thing in the world is not to sell."
- Melvin Goldstein
Reply by Jan Panteltje●February 7, 20232023-02-07
On a sunny day (Mon, 06 Feb 2023 09:47:57 -0800) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<7qe2uh9mv99o5pt91in5j1j9b4drqqirrg@4ax.com>:
>
>https://www.qorvo.com/products/p/QPD1016
>
>The part could be very useful in wideband/pulse applications [1] but
>there are no DC curves, no capacitances, no Spice models, just the
>silly load pull cartoons.
>
>[1] except for the price of course.
>
Bit puzzled by the bias on - bias off sequence for the test board...
page 20 pfd
How critical is that?
Needs some external circuits..
Reply by Simon S Aysdie●February 6, 20232023-02-06
On Monday, February 6, 2023 at 11:17:51 AM UTC-8, Simon S Aysdie wrote:
> On Monday, February 6, 2023 at 11:16:26 AM UTC-8, John Larkin wrote:
> > On Mon, 6 Feb 2023 09:59:15 -0800 (PST), Simon S Aysdie
> > <gwh...@ti.com> wrote:
> > >On Monday, February 6, 2023 at 9:50:01 AM UTC-8, John Larkin wrote:
> > >> https://www.qorvo.com/products/p/QPD1016
> > >>
> > >> The part could be very useful in wideband/pulse applications [1] but
> > >> there are no DC curves, no capacitances, no Spice models, just the
> > >> silly load pull cartoons.
> > >>
> > >> [1] except for the price of course.
> > >
> > >When I designed this PA I just did a load line match per Steve Cripps. The Celeritek data sheet was one page. A spice model was not really necessary.
> > >
> > >https://www.qsl.net/n9zia/metricom/metricom-900-1.jpg
> > Are those coaxial ceramic resonators up top? They can be useful in
> > time domain too.
> Yes. They were Transtech and/or Toko as were both on the AVL, IIRC.
I mean, I am referring to the little ones. The giant ones (12 mm) up top are in the ComNav preselector. ComNav has exceptional Q because of their plating process. For a long time they were th only vendor who could meet specs. Eventually IMC in San Diego managed to meet the requirements. So we had ComNav from Maine and IMC from San Diego.
Reply by Simon S Aysdie●February 6, 20232023-02-06
On Monday, February 6, 2023 at 11:16:26 AM UTC-8, John Larkin wrote:
> On Mon, 6 Feb 2023 09:59:15 -0800 (PST), Simon S Aysdie
> <gwh...@ti.com> wrote:
> >On Monday, February 6, 2023 at 9:50:01 AM UTC-8, John Larkin wrote:
> >> https://www.qorvo.com/products/p/QPD1016
> >>
> >> The part could be very useful in wideband/pulse applications [1] but
> >> there are no DC curves, no capacitances, no Spice models, just the
> >> silly load pull cartoons.
> >>
> >> [1] except for the price of course.
> >
> >When I designed this PA I just did a load line match per Steve Cripps. The Celeritek data sheet was one page. A spice model was not really necessary.
> >
> >https://www.qsl.net/n9zia/metricom/metricom-900-1.jpg
> Are those coaxial ceramic resonators up top? They can be useful in
> time domain too.
Yes. They were Transtech and/or Toko as were both on the AVL, IIRC.
Reply by John Larkin●February 6, 20232023-02-06
On Mon, 6 Feb 2023 09:59:15 -0800 (PST), Simon S Aysdie
<gwhite@ti.com> wrote:
>On Monday, February 6, 2023 at 9:50:01 AM UTC-8, John Larkin wrote:
>> https://www.qorvo.com/products/p/QPD1016
>>
>> The part could be very useful in wideband/pulse applications [1] but
>> there are no DC curves, no capacitances, no Spice models, just the
>> silly load pull cartoons.
>>
>> [1] except for the price of course.
>
>When I designed this PA I just did a load line match per Steve Cripps. The Celeritek data sheet was one page. A spice model was not really necessary.
>
>https://www.qsl.net/n9zia/metricom/metricom-900-1.jpg
Are those coaxial ceramic resonators up top? They can be useful in
time domain too.