The output of the digital integrator is coupled to a digital to analog converter in {HEAD ~ the feedback loop} of {TAIL ~ the sigma delta modulator} 
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The output of the digital integrator is coupled to a digital to analog converter in { HEAD ~ the feedback loop } of { TAIL ~ the sigma delta modulator }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL