Looking for chipamp with J-FET in input stage.

[Progg70]

Is there any nice chipamp with J-FET in the input stage, the signal path?


Regard

Progg70

 

[Nuuk]

Do you mean with a Jfet input buffer?

 

[AndrewT]

the chipamps are generally specified with a very low input offset current.
This suggests that these low input offset chipamps use a FET input LTP as the input stage.
I doubt they are using mosFETs that just leaves jFETs.

 

[Progg70]

Yes something like that or the amp. differential bridge with J-fet.

 

[Progg70]

If you look at the schematics for ex. LM3876 they have the ordinary bipolar transistor input.

 

[Nuuk]

Have a look at OPA541/OPA549.

 

[Progg70]

Thanks