Random weight generating circuit

A random weight generating circuit comprising:

• a first voltage node for providing a supply voltage for the random weight generating circuit;
• a second voltage node at a given electric potential;
• a first circuit element characterised by a first electric current carrier concentration for outputting a first circuit element output signal;
• and
• a second circuit element characterised by a second electric current carrier concentration for outputting a second circuit element output signal, the first and second circuit elements being located between the first and second voltage nodes having a given voltage difference between them, the first circuit element output signal and the second circuit element output signal being different due to the first and second electric carrier concentrations being mismatched,
• wherein the random weight generating circuit comprises a subtraction unit configured to generate one or more random weights such that a respective random weight is represented by a difference between the first circuit element output signal and the second circuit element output signal, wherein the random weight generating circuit further comprises a switch, the operation of which is configured to be controlled by a control signal for selectively turning on or off the random weight generating circuit.