Jan, just compare my buffer with the one Walter Jung has drawn and to a regular one, BUF634 for instance. The difference is cascodes, transistors which only act as diodes and R14 and R15. Why have I done this? Only to limit the amount of different parts. How would you done a diamond buffer?
The pullup, pulldown resistors is just in case only. You can use this buffer with single supply.
All measurements is without feedback, just the buffer alone. I have though a reservation about the measurements but Walt Jung claimed rather good performance and when was he totally wrong?
SMD is "ont i stjärten"(*) when it comes to repair but don't break it.... just design in protection which works if it is needed. In my case I have no protection because it should work in known conditions. Walter Jung had suggestions how it could be done.
The loads I have used are 100k, 220 ohms and 55 ohms.
(*) Fred will translate for you...
The pullup, pulldown resistors is just in case only. You can use this buffer with single supply.
All measurements is without feedback, just the buffer alone. I have though a reservation about the measurements but Walt Jung claimed rather good performance and when was he totally wrong?
SMD is "ont i stjärten"(*) when it comes to repair but don't break it.... just design in protection which works if it is needed. In my case I have no protection because it should work in known conditions. Walter Jung had suggestions how it could be done.
The loads I have used are 100k, 220 ohms and 55 ohms.
(*) Fred will translate for you...
I felt like it but it's not the Fred style exactly. It's super universal, inverting och non-inverting buffer, inverting or non-inverting LM3886, DC-servo or not for both inverting and non-inverting LM3386, bridge connection in inverting or non-inverting mode with non-inverting or inverting input buffer with or without input coupling caps along with an optional output filter plus an input filter....have I forgot something?... it's not SMD :PMA said:Per,
I did not know you were interested in Gainclone clones development and sale ....
:up
http://www.elecdesign.com/Globals/PlanetEE/Content/2800.html
The rest is gone for the moment, can't be found. Maybe they will turn up some day.
Scanned articles at Walt's homepage.
http://home.comcast.net/~walt-jung/wsb
The rest is gone for the moment, can't be found. Maybe they will turn up some day.
Scanned articles at Walt's homepage.
http://home.comcast.net/~walt-jung/wsb
Hi Per.
Yes you are right about the wide bandwidth ...
I got 260MHz with a source impedance of 1 Ohm.
I got 123MHz with a source impedance of 100 Ohm.
And i got 35MHz with a source impedance of 1 KOhm.
But i would say that in a real world application The buffer will run around 1KOhm - 20Ohm at > 20MHz.
A fast opamp like the AD8610 will have a Zout peaking at 60MHz of 50Ohm.
Yes you are right about the wide bandwidth ...
I got 260MHz with a source impedance of 1 Ohm.
I got 123MHz with a source impedance of 100 Ohm.
And i got 35MHz with a source impedance of 1 KOhm.
But i would say that in a real world application The buffer will run around 1KOhm - 20Ohm at > 20MHz.
A fast opamp like the AD8610 will have a Zout peaking at 60MHz of 50Ohm.
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