An exemplary delta-sigma modulator loop applied to convert a continuous-time input signal into a discrete-time output signal. Said body also comprising a movable means which defines a cavity filled with the formulation and makes it possible to discharge said formulation through the opening by exposing said mobile means to a pressure. The cross-sectional figure of respective first portions in the Y direction and perpendicular to the substrate surface is provided with at least one protruding portion so as to have the width in the Y direction wider than that of neighboring portions. At least two of the received signals are mixed and then encoded, using the adapted encoder. Thus, the foldable shovel may be optimally configured as either a scooping device or a pushing device.