The control signal is processed by a FSM that individually turns on or off {HEAD ~ the transistors} within the parallel branch until the DUT impedance value falls within {TAIL ~ the desired range} 
The control signal is processed by a FSM that individually turns on or off { HEAD ~ the transistors } within the parallel branch until the DUT impedance value falls within { TAIL ~ the desired range }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL