Electronic apparatus for delivering Coherent Sine Burst Irreversible Electroporation energy to a biological tissue to be treated, the electronic apparatus comprising: at least one electrode positionable either on or near the biological tissue to be treated; and a power generator for supplying electric energy to the or each electrode, said power generator being configured to generate a respective electric signal to energize the or each individual electrode, wherein the or each electric signal is formed by alternating over time a first electric signal with a second electric signal, each first electric signal being the same; said first electric signal is supplied to an individual electrode during a first time interval and said second electric signal is supplied to the individual electrode during a second time interval subsequent to the first time interval; said first electric signal is a continuous bipolar signal comprising two or more basic sine waves in said first time interval, each basic sine wave having a peak-to-peak mean amplitude in the range 2,000 V to 20,000 V and consisting of one positive half-wave and one negative half-wave, each half-wave having the same width, and the first electric signal having a frequency in the range 25 kHz to 75 kHz; and said second electric signal has an amplitude equal to zero in said second time interval, the electronic apparatus further comprising a plurality of electrodes, wherein said power generator comprises a single control unit and a power unit for generating said respective electric signals; said power unit being electrically connected to all electrodes of said plurality of electrodes whereby the plurality of electrodes provides one of a unipolar voltage, a bipolar voltage, or a combination of bipolar and unipolar voltage; wherein the power unit is configured, in the presence of an electrical return path, to supply adjacent electrodes with individual electric signals that are out of phase with one another in order to cause the electrodes to provide a combination of bipolar and unipolar voltage; wherein the power unit is configured to vary the extent to which the individual electric signals supplied to adjacent electrodes are out of phase with one another. at least one electrode positionable either on or near the biological tissue to be treated; and a power generator for supplying electric energy to the or each electrode, said power generator being configured to generate a respective electric signal to energize the or each individual electrode, wherein the or each electric signal is formed by alternating over time a first electric signal with a second electric signal, each first electric signal being the same; said first electric signal is supplied to an individual electrode during a first time interval and said second electric signal is supplied to the individual electrode during a second time interval subsequent to the first time interval; said first electric signal is a continuous bipolar signal comprising two or more basic sine waves in said first time interval, each basic sine wave having a peak-to-peak mean amplitude in the range 2,000 V to 20,000 V and consisting of one positive half-wave and one negative half-wave, each half-wave having the same width, and the first electric signal having a frequency in the range 25 kHz to 75 kHz; and said second electric signal has an amplitude equal to zero in said second time interval, the electronic apparatus further comprising a plurality of electrodes, wherein said power generator comprises a single control unit and a power unit for generating said respective electric signals; said power unit being electrically connected to all electrodes of said plurality of electrodes whereby the plurality of electrodes provides one of a unipolar voltage, a bipolar voltage, or a combination of bipolar and unipolar voltage; wherein the power unit is configured, in the presence of an electrical return path, to supply adjacent electrodes with individual electric signals that are out of phase with one another in order to cause the electrodes to provide a combination of bipolar and unipolar voltage; wherein the power unit is configured to vary the extent to which the individual electric signals supplied to adjacent electrodes are out of phase with one another.