The Boulder 993 Gain Stage

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Nelson Pass

Nelson Pass

The one and only
Joined 2001
Paid Member
Jensen's circuit was a very nice piece, but is a bit dated
after 20+ years.

You will be interested to know that Deane received a US
patent on the inductors on the diff pair as a means of
lowering the open loop gain at higher frequencies and
improving loop stability.

:hypno2:
 
mlloyd1

mlloyd1

Member
Joined 2001
Ahhhh....
Nelson, thanks for explaining why I haven't seen those inductors in any other designs! I never considered that the idea was patented.

And that hypno thingie is making me sleepy ...
Nelson Pass said:
...
You will be interested to know that Deane received a US
patent on the inductors on the diff pair as a means of
lowering the open loop gain at higher frequencies and
improving loop stability.
Click to expand...
 
W

wahab

Member
Joined 2009
Nelson Pass said:
You will be interested to know that Deane received a US
patent on the inductors on the diff pair as a means of
lowering the open loop gain at higher frequencies and
improving loop stability.

:hypno2:
Click to expand...


Great..
Somewhat like the infamous Rambus, it s easier to patent
something that already exists.
If my memory is good, inductors implemented in a differential
emitters date back from the mid 60s.
 
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