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Old 4th Dec 2022, 8:52 pm   #18
G.Castle
Heptode
 
Join Date: Dec 2020
Location: Swaffham, Norfolk, UK.
Posts: 582
Default Re: FET amplifier information biasing voltage and circuits etc

Quote:
Originally Posted by Hartley118 View Post
It was interesting that, rather that being randomly distributed, the device characteristics fell into two definite groups of bias requirement.

Martin
This is also something I have recently observed, or rather observed large differences between batches of the same component type. So much so that a fresh supply of the same type from the same brand were so different as to render an analog switch circuit inoperable.

It's probable that devices from the same wafer have reasonably close characteristics as would have been suggested by the investigation and subsequent testing by the young friend who was tripped up by this feature, there was definitely two very different discreet levels of bias required to switch the device, such that the circuit needed to be redesigned.

Greg.
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