I think you have to define the transfer function of the filter. The transfer function is the ratio of response divided by excitation. If you are going to use a current source input excitation, what is the response you desire? Is the response (output) the voltage at the output of the filter structure? Is the response the voltage at the input port? Also, you need to specify the passband and stopband frequencies and the attenuation required at these frequencies. Your question is quite vague without having some concrete values.