Patent ID: 7616050

Claim:
A power supply circuit for producing a reference current with a prescribable temperature dependence, the power supply circuit comprising: a current mirror outputting a first current and a second current; a resistor formed by at least two reference resistors having prescribable temperature coefficients that are different from one another; and two current sinks, each current sink having a terminal of a different size from the other sink, which at their respective input receive the first current or the second current, and in which the current sinks at their respective outputs are connected to a node having a reference potential, the output of at least one current sink being connected via the resistor to the node having the reference potential, wherein a voltage across said resistor is a temperature dependent voltage which has a known value at a reference temperature which known value is proportional to the respective different sizes of each of the terminals of said current sinks wherein the total resistance of said resistor is set to a value at said reference temperature to produce said reference current.