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Old 2nd February 2009, 04:20 PM   #1
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Default 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
Click the image to open in full size.

and Input Stage B - from SiliconChip
Click the image to open in full size.

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

sorry for my Englis
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Old 2nd February 2009, 04:35 PM   #2
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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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