{HEAD ~ The analog portion} of {TAIL ~ the transmit path} is coupled to a calibrator which measures the corresponding analog response 
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{ HEAD ~ The analog portion } of { TAIL ~ the transmit path } is coupled to a calibrator which measures the corresponding analog response
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH