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Old 31st January 2009, 05:29 AM   #1
lineup is offline lineup  Sweden
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Arrow 2A ClassA using EXICON Lateral

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.
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File Type: png 1_ecf20n20_test.png (2.3 KB, 392 views)
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Old 31st January 2009, 05:32 AM   #2
lineup is offline lineup  Sweden
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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
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File Type: png 2_ecf20n20_sweep.png (3.3 KB, 340 views)
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Old 31st January 2009, 05:54 AM   #3
lineup is offline lineup  Sweden
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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
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File Type: png 3_ecf20n20_simplified_circuit.png (1.9 KB, 365 views)
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Old 31st January 2009, 09:14 PM   #4
lineup is offline lineup  Sweden
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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.
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File Type: png preamp_x4.png (12.6 KB, 289 views)
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Old 31st January 2009, 11:32 PM   #5
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Default Re: 2A ClassA using EXICON Lateral

Quote:
Originally posted by lineup
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.

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