Current mirror

[abzug]

Is this useful for audio? The claim is that this design has bandwidth independent of the input current: http://www.google.com/patents?id=sxgIAAAAEBAJ&dq=6323723

The type of current mirror I've usually used is this one: http://upload.wikimedia.org/wikipedia/en/2/24/Imp_wilson_cs.gif

 

[roender]

Hart of the AD797

 

[nikwal]

.. Imho there should be a sticky, or at least a dedicated thread where interresting google.com/patents links could gather.. google patents is the best thing I saw for a while, man that page eats time..

 

[Zen Mod]

http://www.pat2pdf.org/

handy

 

[unclejed613]

they've been using current mirrors for audio since the '70's.

 

[abzug]

they've been using current mirrors for audio since the '70's.

Obviously that's not quite what I was asking.

I was asking if the improvements of this current mirror over simpler ones is likely to make a positive audible difference.

 

[Fanuc]

Obviously that's not quite what I was asking.

I was asking if the improvements of this current mirror over simpler ones is likely to make a positive audible difference.

For definate. Different CM designs can be alot faster, have lower noise, be cascoded to get >100mOhm impedances with improvements in negative PSRR and so on. A perfectly legitimate question to ask!.

Be very vary of people with designs based on miller Cdom (all there knowledge is about that type of design) and issues with that type of design. What is advantageous to a Doug Self type design is not neccasirily to other topology's or better capabilities have already been acheived already.

I like designer's who are Off the Wall!. 🙂

Best Regards

Kevin

 

[abzug]

So any suggestions on the best approach to try to tweak the current mirror in Hawksford's I/V?
http://www.essex.ac.uk/dces/researc...Current steering transimpedance amplifier.pdf
Fig.4-4, upper left