Re: Attenuation and signal conditioning circuit

On Nov 18, 3:59 am, .gemay[@].prv4.onet.pl wrote:
Hi

I'm trying to make an attenuator and a driver for differential amplifier.
That's what I figure out:

http://temp0.cba.pl/front_temp.pdf

But I'm not convinced that this will be work very well.

FETs follower is to separates input resistors and AD8021 which requires
input bias current.

I'm using MOSFETs to switching resistor in inputs voltage divider (from
0.01 to 0.33) and chainging amplifier gain (from x2 to x5)

Will be that work? What I should change? Or maybe I should make that in a
different way?
Any suggestion or opinion will be helpful
You can be honest, I'm not good with analog designing so that will be not
offence for me. :)

My goals are:
Low nois and distortions in bandwidth 20Hz-1MHz
no DC at output

Noir

Have you considered using a MDAC as a programable attenuator? For the
differential amp, you need to match drive impedance at each leg. [I
don't do discrete designs, so I can't spit out part numbers without
doing research.]

Regarding the other posts, this is a place to learn, not solicit
business. If someone posts a RFQ, that's a different story.
.