Just an idea for a new I/V stage: what about curent mirors?

Bricolo · 7th April 2004, 07:08 PM

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

Pedja · 8th April 2004, 12:11 AM

Quote:

Originally posted by Bricolo
Has this already been done?

Maybe. Maybe not. Consider MAX435.

Bricolo · 8th April 2004, 09:51 AM

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

7th April 2004, 07:08 PM	#1
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Just an idea for a new I/V stage: what about curent mirors? 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

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8th April 2004, 09:51 AM	#3
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	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

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