A switch apparatus , comprising: a plurality of current branches, each having current terminals coupled between an output node and a reference node (GND), each having a control terminal, and each developing a current in response to a drive signal (GD1-N) applied to the control terminal; and slope circuitry (104, 204. 304) having at least one input responsive to an input signal (DIN) and having a plurality of drive outputs each coupled to a control terminal of a corresponding one of the plurality of current branches, wherein the slope circuitry activates or deactivates the plurality of current branches one at a time according to a corresponding one of a plurality of slope functions in response to transition of the input signal (DIN) so that the output node follows a predetermined voltage-current function, wherein each slope function is a linear or non-linear function other than a step function to transition each drive output between first and second voltage levels with a configured or inherent delay, characterized in that the slope circuitry further comprises: a current mirror that drives a predetermined current between an upper node and a lower node ; and a plurality of slope control circuits (SC1-SCN), each slope circuit comprising: a capacitor (C1) coupled to a drive output node providing a corresponding one of the plurality of drive signals (GD1-GDN); a first inverter having an input coupled to an input node and having an output coupled to an intermediate node ; and a second inverter coupled to the upper and lower nodes of the current mirror , having an input coupled to the intermediate node and an output coupled to the drive output node for charging or discharging the capacitor (C1) with the predetermined current. a plurality of current branches, each having current terminals coupled between an output node and a reference node (GND), each having a control terminal, and each developing a current in response to a drive signal (GD1-N) applied to the control terminal; and slope circuitry (104, 204. 304) having at least one input responsive to an input signal (DIN) and having a plurality of drive outputs each coupled to a control terminal of a corresponding one of the plurality of current branches, wherein the slope circuitry activates or deactivates the plurality of current branches one at a time according to a corresponding one of a plurality of slope functions in response to transition of the input signal (DIN) so that the output node follows a predetermined voltage-current function, a current mirror that drives a predetermined current between an upper node and a lower node ; and a plurality of slope control circuits (SC1-SCN), each slope circuit comprising: a capacitor (C1) coupled to a drive output node providing a corresponding one of the plurality of drive signals (GD1-GDN); a first inverter having an input coupled to an input node and having an output coupled to an intermediate node ; and a second inverter coupled to the upper and lower nodes of the current mirror , having an input coupled to the intermediate node and an output coupled to the drive output node for charging or discharging the capacitor (C1) with the predetermined current. a capacitor (C1) coupled to a drive output node providing a corresponding one of the plurality of drive signals (GD1-GDN); a first inverter having an input coupled to an input node and having an output coupled to an intermediate node ; and a second inverter coupled to the upper and lower nodes of the current mirror , having an input coupled to the intermediate node and an output coupled to the drive output node for charging or discharging the capacitor (C1) with the predetermined current. <EOS>