Patent ID: 7511565

Claim:
An integrated circuit apparatus, the apparatus comprising: a first integrated circuit comprising a first current source requiring compensation; and a compensation circuit comprising: a feedback control loop arranged, when in use, to receive a variable voltage and a reference voltage and generate a corrective current in response to a difference between the variable voltage and the reference voltage; a voltage generation circuit comprising a second current source and arranged, when in use, to receive the corrective current and combine the corrective current with a current flowing through the second current source in order to generate the variable voltage, the variable voltage being substantially equal to the reference voltage when the current flowing through the second current source is in accordance with at least one design expectation of the second current source; wherein the second current source is the same as the first current source, the first and second current sources having been formed by substantially common process parameters; and the first current source is coupled to the compensation circuit in order to receive a compensation current corresponding to the corrective current.