Hi all,
I was wondering how I could build an I/V stage with a lower output impedance that the classical 1.5kR.
I saw 2 possibilities (while still keeping the same output voltage)
- use a buffer
- use a smaller I/V resistor and feed it with more current.
One posssibility for the 2nd method would be to use curent mirors; with a 2:1 (3:1, 4:1, or even more) curent ratio.
Has this already been done?
I tried so simulate it, but haven't suceeded to have something good now. I'll work on it later thie evening.
Alex
I was wondering how I could build an I/V stage with a lower output impedance that the classical 1.5kR.
I saw 2 possibilities (while still keeping the same output voltage)
- use a buffer
- use a smaller I/V resistor and feed it with more current.
One posssibility for the 2nd method would be to use curent mirors; with a 2:1 (3:1, 4:1, or even more) curent ratio.
Has this already been done?
I tried so simulate it, but haven't suceeded to have something good now. I'll work on it later thie evening.
Alex
Thank you for the hint. 😉
That's what I've done now:
the distortion is very small in the simulation (someting like 10^-9 %)
but there are some ptoblems to solve:
-there's an DC ofset on the input (a diode drop above ground), can be no problem with a 1543
-the output has also a DC ofset, so has to be AC coupled
That's what I've done now:
the distortion is very small in the simulation (someting like 10^-9 %)
but there are some ptoblems to solve:
-there's an DC ofset on the input (a diode drop above ground), can be no problem with a 1543
-the output has also a DC ofset, so has to be AC coupled
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