Circuit for generating a process-independent current

A circuit for current compensation, comprising:

• a first resistor circuit that is arranged to provide a first current based, in part, on a first voltage, wherein an external recharge resistor circuit is arranged to provide an external recharge current, and wherein the first voltage is based, in part, on a voltage across the external recharge resistor circuit;
• a second resistor circuit that is arranged to provide a second current based, in part, on a reference voltage, wherein the second resistor circuit is substantially matched with the first resistor circuit;
• a current arithmetic circuit that is arranged to provide a substantially process-independent current such that the substantially process-independent current is substantially given by:
• A*I1*(Iext/I2), wherein A corresponds to a substantially constant predetermined factor;
• I1 corresponds to the first current;
• I2 corresponds to the second current;
• Iext corresponds to another external current;
• and wherein the said another external current is provided by another external resistor circuit based, in part, on the reference voltage.

An apparatus for generating a substantially process-independent current, comprising:

• means for providing a first current, based, in part, on a first voltage;
• means for providing a second current based, in part, on a second voltage, wherein the means for providing the first current is substantially matched with the means for providing the second current;
• and
• means for providing the substantially process-independent current such that the substantially process-independent current is substantially given by:
• A*I1*(Iext/I2), wherein A corresponds to a substantially constant predetermined factor, I1 corresponds to the first current, I2 corresponds to the second current, and Iext corresponds to an external current wherein the means for providing the substantially process-independent current is arranged to receive the external current.