A switch apparatus (100, 200, 300), comprising: a plurality of current branches, each having current terminals coupled between an output node (108, 208, 308) and a reference node, 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 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 (104, 204, 304) 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 so that the output node (108, 208, 308) 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 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 (810, 812) 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 with the predetermined current. a plurality of current branches, each having current terminals coupled between an output node (108, 208, 308) and a reference node, 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 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 (104, 204, 304) 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 so that the output node (108, 208, 308) 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 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 (810, 812) 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 with the predetermined current. a capacitor 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 (810, 812) 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 with the predetermined current.