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Walter Harley wrote:
> "John Larkin" <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
> message news:3cj3r1tr6dg1hsdfh405eq4u8bn7e425nt@xxxxxxxxxx
>> [...]
>> Why not measure it?
>
> Indeed I could. Or I could use a simulator.
>
> But it seemed I should be able to analyze such a simple circuit by
> hand, based on information available in the datasheet. I guess not!
Yes you can. I already pointed out where the basic equations can be
found. For the simple model, the device is either in linear (ron) region
or constant current (saturation) region. The formula for the gm in these
regions are available. Have you tried google?
In saturation the gm varies as sqrt(I). If you know it at one current,
then it is known at all currents. Do we need to hold you hand as well?
Kevin Aylward
431infoEXTRACT@xxxxxxxxxxxxx
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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