Op-amp - dual to Single supply conversion to avoid floating of input signal?
Inverting Op-Amp with gain &lt; 1 will always tend to give output only in negative polarity and for that it draw power from negative supply of Op-Amp.If we use Single supply Opamp negative supply line of Op-Amp is grounded and output will be zero or low positive voltage. 

We can attenaute positive voltages using inverting Op-Amp with dual supply as given in the picture using extra reference voltage Vref.