At the inverting input of the operational amplifier Ao a virtual ground is created by means of {HEAD ~ feedback} from the output node Vout through {TAIL ~ feedback resistor Rfb} 
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At the inverting input of the operational amplifier Ao a virtual ground is created by means of { HEAD ~ feedback } from the output node Vout through { TAIL ~ feedback resistor Rfb }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL