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AN9515 - Multiplier Improcers the Dynamic Range of Echo Systems

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Multiplier Improves the Dynamic Range of Echo Systems (HA-2556, HA-5177) Application Note November 1996 AN9515.1 Introduction In an echo system the returned signal amplitude is a function www.datasheet4u.com of the distance to the target, and it can be expressed mathe- matically as function of time. An echo system with a fixed gain preamp has poor dynamic range because close targets (short return times) have high signal amplitudes while distant targets (long return times) have much lower signal amplitudes. In fixed gain systems, the biggest signals establish the upper preamp gain limit based on not saturating the system, and this gain may not be high enough to process small returns properly.