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Sub-ranging ADCs are a hybrid of flash and successive approximtion ADCs. The more significant bits are determined by a successive approximation technique, and the lower bits converted by a flash technique. This gives the ADCs some of the speed of an all-flash ADC without the cost implications, whilst retaining the resolution of successive approcimation ADCs.  Often, the ADCs available have strict voltage ranges, and signal conditioning is needed before the voltage applied is safe to measure. This can consist of simple voltage dividers or operational amplifers, which can be arranged in a plethora of configurations. The most universal application is the instrumentation amplifier, which measures the differential voltage between two input terminals, with an adjustable gain.  \subsection{Voltage Control}