# Signal Conditioning

Thread Starter

#### Cashew.8

Joined Oct 4, 2021
5
How to design a signal conditioner with pre-settable gains of X1 X2 X5 X10 using opamp?

#### MrChips

Joined Oct 2, 2009
25,010
Welcome to AAC!

Tell us more of the intended application.
What is the frequency range?
What is the input signal voltage?
What are the supply voltages?
Have you designed with op-amps before?

Thread Starter

#### Cashew.8

Joined Oct 4, 2021
5
Welcome to AAC!

Tell us more of the intended application.
What is the frequency range?
What is the input signal voltage?
What are the supply voltages?
Have you designed with op-amps before?
Hi. It was actually my tutorial question. The original question is: Design a signal conditioning circuit that accepts a common mode input to drive an ADC that has a differential input. It should have the pre-settable gains of X1 X2 X5 X10 and an anti-aliasing glitter allowing response up to 600Hz. The ADC resolution is 12 bits over a 3V range. The input resistance to the signal conditioning circuit is 600,000 ohms and there is a second low pass filter with a response from DC to 600Hz.

#### MrChips

Joined Oct 2, 2009
25,010
Since this is a school assignment you have to show your work first and then we can guide you after that.

Thread Starter

#### Cashew.8

Joined Oct 4, 2021
5
Since Signal conditioning has amplifying and filtering processes. So my intension was to use an inverting amplifier for amplification and two cascaded op-amp for second-order filtering. However, since I don't understand how to have the pre-settable gains, so I have no idea whether I can still use the ordinary way to design the inverting op-amp.

#### MrChips

Joined Oct 2, 2009
25,010
Take one step at a time.
Start with a fixed gain of 10 and the required frequency response. You can do the other gains another time.

Thread Starter

#### Cashew.8

Joined Oct 4, 2021
5
So this means I will need to design 4 circuits for 4 gains?

#### MrChips

Joined Oct 2, 2009
25,010
So this means I will need to design 4 circuits for 4 gains?
No. We will come to that in good time.

Thread Starter

#### Cashew.8

Joined Oct 4, 2021
5
Sure. I will try it. Thank you very much.

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