Re: [Amps] grounded-gate power MOSFET

[R.Measures <r@somis.org>]

On May 14, 2004, at 2:23 AM, Angel Vilaseca wrote:

> Hi,
>
> I am planning to build a PA for 20 meters and I saw interesting designs
> using power MOSFETs. One of the difficult points in such designs is
> input matching due to the high gate capacitance of the MOSFETs,
> particularly if several are used.
>
> The grounded-grid configuration is a time-honored classic for vacuum
> triodes. I have never seen power MOSFETs used that way.
>
> My question is: Could a gate-grounded circuit help with the 
> power-MOSFET
> input matching problem?

  Angel -- Like a grid-driven vacuum tube in Class AB1, a gate-driven 
FET draws zero current from the driver.  Thus, an input terminator-R is 
needed with both devices.
> More generally: Has someone already tried to build a grounded-gate 
> power
> MOSFET amplifier?
>
>
>
> Angel Vilaseca HB9SLV
>
>
>
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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