FREQUENCY RESPONSE / NORMALISATION AND FILTER CIRCUITS
Passive Low Pass Filter 

figure R : passive LPF

    ,           ,                    

 For S = jw and for R = 1 ohm and C = 1 farad =>       

    

    transfer function         

the amplitude would be :       ,   

or expressed in dB of loss:   

         ,   

         amplitude response                       phase response

figure S : bode plots of passive LPF