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hello
CCS in Amplifier with low thermal drift + Red LED spice model
Red LED is very good and useful for CSS, constant current sources, in amps.
If, for example, placing a Flat Red LED into close thermal contact with a TO92 Transistor
you get almost perfect thermal compensation.
And the CSS keep the current very constant.
For an Amplifier input differential stage this is a very good thing.
Especially when we need low offset and best performance at high/medium voltage gains.
Because if CCS will deviate, then also offset will change.
RED LED also makes a low noise voltage reference in these CCS,
if used with a Diode Current of like 2 - 5 mA.
See my attachment drawing
for one such very good constant current source.
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My problem is that in my Simulation Software, I have no good spice model.
The RED LED that comes with Electronics Workbench Multisim,
has only one voltage 1.66V, whatever current I put into the LED.
This is bad! You would expect better from an advanced commercial spice software.
I want to have a good model for a normal standard RED LED. (there are many types)
Those you can buy 100 pieces of, for a low price.
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