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Havenwood 2nd February 2009 04:20 PM

Input Stage Question
 
Hi, I have a question:

Is there a real difference between the input stage A and B?

Input Stage A - from Randy Slone
http://img147.imageshack.us/img147/6...tstageizj1.jpg

and Input Stage B - from SiliconChip
http://img228.imageshack.us/img228/9...stageiipm2.jpg

Some interesting links to read more about it?
How is configured the VAS in Input Stage A

sorry for my Englis ;)

homemodder 2nd February 2009 04:35 PM

Yes there is a difference, input stage of randy sloan does not work. The vas bias current is not defined and causes output offset to be unstable. The more recent sloan design has changed the current mirror ltp to cascodes which works. Do a search here, of randy sloan, you will find many info about this.


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