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Here is a Maple resolution of the circuit.

You can see that fundamentally, it is a "4th" order filter.
However, one can note that the zero and one pole are approximately at the some place.
So, it is "really" a 3rd order filter.

Here is the result when c3 & c2 are only 4.7 pF.

Here is a Maple resolution of the circuit.

You can see that fundamentally, it is a "4th" order filter.
However, one can note that the zero and one pole are approximately at the some place.
So, it is "really" a 3rd order filter.

Here is the result when c3 & c2 are only 4.7 pF.

Here is a resolution Maple of the circuit.

You can see that fundamentally, it is a "4th" order filter.
However, one can note that the zero and one pole are approximately at the some place.
So, it is "really" a 3rd order filter.

Here is the result when c3 & c2 are only 4.7 pF.

Here is a Maple resolution of the circuit.

You can see that fundamentally, it is a "4th" order filter.
However, one can note that the zero and one pole are approximately at the some place.
So, it is "really" a 3rd order filter.

Here is the result when c3 & c2 are only 4.7 pF.

Here is a resolution Maple of the circuit.

You can see that fundamentally, it is a "4th" order filter.
However, one can note that the zero and one pole are approximately at the some place.
So, it is "really" a 3rd order filter.

Here is the result when c3 is only 4.7 pF.

Here is a resolution Maple of the circuit.

You can see that fundamentally, it is a "4th" order filter.
However, one can note that the zero and one pole are approximately at the some place.
So, it is "really" a 3rd order filter.

Here is the result when c3 & c2 are only 4.7 pF.