Second order low pass filter with unity gain

[Henry]

Homework Statement

I need to design a second order filter with unity gain.

Homework Equations

None - not taking component values into account for now.

The Attempt at a Solution

Is this a correct method of creating a 2nd order low pass filter with unity gain?

 

[NascentOxygen]

That is one such candidate; not what I'd consider a good representative of such a filter, but it certainly fits.

What is the application you need it for?

 

[Henry]

I had to design a two part system with a transimpedance amplifier then a second order low pass filter for a piece of coursework. It's specified that we cannot use a power supply larger than 5v for the opamps though, so I designed the system to take care of all of the gain during the transimpedance stage.

Sorry if that sounds confusing, I'm still getting my head around this a little bit.

 

[NascentOxygen]

What you have there is basically a passive two-stage filter, so its Bode plot is not nice and level over any range, it begins drooping right from DC.

 

[Henry]

How would I go about changing that?

 

[NascentOxygen]

How would I go about changing that?

Do you need it to be any different, though?

For flatter responses, google: active filters.

 

[Henry]

Probably not, the question wasn't particulary specific, it just asked for a second order low pass filter so that's probably fine. Thank you for your help!