The diode ensures that {HEAD ~ the preamplifier} is not saturated for {TAIL ~ an impermissbly long period} of time at the limit of its operating range due to the current peaks 
The diode ensures that { HEAD ~ the preamplifier } is not saturated for { TAIL ~ an impermissbly long period } of time at the limit of its operating range due to the current peaks
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH