{HEAD ~ The circuit} can be modified to include {TAIL ~ a multiplication unit} for multiplying the input signal, the first delayed signal or the output signal by a predetermined constant to obtain a desired direct current gain 
modified to include
{ HEAD ~ The circuit } can be modified to include { TAIL ~ a multiplication unit } for multiplying the input signal , the first delayed signal or the output signal by a predetermined constant to obtain a desired direct current gain
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH