A current reference source, comprising: a first current source (IBIAS) to generate a first current, the first current source including a first terminal and a second terminal, the first terminal coupled to a first power supply voltage; and a converter to generate a first voltage signal based on a magnitude of the first current, the converter including: a first active device including a first terminal, a second terminal and a third terminal, the first terminal coupled with the second terminal of the first active device and coupled with the second terminal of the first current source (IBIAS); a first resistance device (M3; R1) including a first terminal and a second terminal, the first terminal of the first resistance device coupled with the third terminal of the first active device, and the second terminal of the first resistance device (M3; R1) coupled to a second power supply voltage; a first buffer including an input and an output, the input of the first buffer coupled with the first and second terminals of the first active device, the first voltage signal to be output via the output of the first buffer; characterised in that the current reference source is further comprising: a first switch including a signal input, a signal output and a control input, the signal input of the first switch coupled with the output of the first buffer, the control input of the first switch coupled with a control signal, and the first switch being responsive to the control signal to sample and hold the output of the first buffer; and at least one tile current reference coupled to receive the first voltage signal, the at least one tile current reference remotely located from the current reference source a first current source (IBIAS) to generate a first current, the first current source including a first terminal and a second terminal, the first terminal coupled to a first power supply voltage; and a converter to generate a first voltage signal based on a magnitude of the first current, the converter including: a first active device including a first terminal, a second terminal and a third terminal, the first terminal coupled with the second terminal of the first active device and coupled with the second terminal of the first current source (IBIAS); a first resistance device (M3; R1) including a first terminal and a second terminal, the first terminal of the first resistance device coupled with the third terminal of the first active device, and the second terminal of the first resistance device (M3; R1) coupled to a second power supply voltage; a first buffer including an input and an output, the input of the first buffer coupled with the first and second terminals of the first active device, the first voltage signal to be output via the output of the first buffer; a first active device including a first terminal, a second terminal and a third terminal, the first terminal coupled with the second terminal of the first active device and coupled with the second terminal of the first current source (IBIAS); a first resistance device (M3; R1) including a first terminal and a second terminal, the first terminal of the first resistance device coupled with the third terminal of the first active device, and the second terminal of the first resistance device (M3; R1) coupled to a second power supply voltage; a first buffer including an input and an output, the input of the first buffer coupled with the first and second terminals of the first active device, the first voltage signal to be output via the output of the first buffer; characterised in that the current reference source is further comprising: a first switch including a signal input, a signal output and a control input, the signal input of the first switch coupled with the output of the first buffer, the control input of the first switch coupled with a control signal, and the first switch being responsive to the control signal to sample and hold the output of the first buffer; and at least one tile current reference coupled to receive the first voltage signal, the at least one tile current reference remotely located from the current reference source a first switch including a signal input, a signal output and a control input, the signal input of the first switch coupled with the output of the first buffer, the control input of the first switch coupled with a control signal, and the first switch being responsive to the control signal to sample and hold the output of the first buffer; and at least one tile current reference coupled to receive the first voltage signal, the at least one tile current reference remotely located from the current reference source