2A ClassA using EXICON Lateral

[lineup]

Exicon lateral MOSFET are good transistors.
The vGS dependent loss is 'only' like 1.5V, compared to 4.5V for IRF MOSFET.
I will use EXICON ECF20N20. Datasheet ECF20N20

First thing I will run a VGS vs. Current test.
My sim setup in attachment.

 

[lineup]

Here are the results of my VGS vs. Drain Current.
I use MultiSim DC Sweep.

At 3.75 A vgs is 2.1 Volt
At 2.00 A vgs is 1.5 Volt
At 0.25 A vgs is 0.7 Volt

So for output current 2.0 A +- 1.75 A
we get VGS
1.5V +0.6V and -0.8V

 

[lineup]

Here is the simplified circuit I will use for Class A single end.
- 40 VDC supply
- One 2 Ampere current source
- Output at 20 Volt
- Negative feedback from Drain to Gate

 

[lineup]

I will need one Inverted preamp.
This will match the inverted power amplifier.

And I will add some voltage gain to this preamp, x4.
This way I can reduce the voltage gain to maybe 50%
in the Lateral power amp.
Resulting in lower distortion overall.

Here is my 3 Transistor preamp with very low distortion for being such a basic circuit.
Also in this amp I use feedback back to BASE.

 

[Nelson Pass]

The vGS dependent loss is 'only' like 1.5V, compared to 4.5V for IRF MOSFET.

Of course there are a few occasions where a higher Vgs is very useful.

😎