A device for providing a substantially constant current includes first and second current mirrors. The first current mirror receives a first amount of a first bias current and provides an output current based on the first amount of the first bias current, the first bias current being based on a fixed voltage. The second current mirror receives a second bias current and a second amount of the first bias current, the second bias current being based on a variable voltage. The second bias current and the second amount of the first bias current vary directly with variations in the variable voltage, and the first amount of the first bias current varies inversely with variations in the variable voltage. The output current remains substantially constant based on the variations in first amount of the first bias current, which counteract effects on the output current by variations in the second voltage.