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three stage RC low pass filter ct off frequency expression

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singhji0000

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can anyone help me with the cutoff frequency for third order passive low pass filter with three stage RC filter circuit.i tried to derive it but its very very compex transfer function.

Please let me know any reference of the cut off frequency expression for three stage low pass RC filter.
 

Dear singhji0000
Hi
It is important to pay attention to : the filters have out put and input impedance. when you wanna make high order filters , you should design from latest stage to first stage( it will be easy) . if you design the filters with balanced impedance together , your transfer function will be optimum.
Best Wishes
Goldsmith
 

An expression for the transfer function of equal time constant passive filters can be found in many text books. For the 3rd order, it's:
Code: 
H(s) = 1/(T³s³+5T²s²+6Ts+1)
 

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