Patent ID: 7522003

Claim:
A biasing circuit for a current mirror comprising: a primary biasing circuit that provides a biasing voltage and a primary biasing voltage, the biasing voltage being the output of the primary biasing circuit generating an input current for a current mirror; a replica biasing circuit that provides a replica voltage; and an amplifier having a first input terminal coupled to receive the primary voltage from the primary biasing circuit, a second input terminal coupled to receive the replica voltage from the replica biasing circuit, and an output terminal coupled to the primary biasing circuit to adaptively adjust a current through the primary biasing circuit according to the received voltages, wherein said replica biasing circuit comprises: a first resistive element, wherein said first resistive element resistive characteristics; a first current source, wherein said first current source having the first resistive element for generating a current as a function of the first resistive element; a first node to couple to receive the first current source to generate the replica voltage at the first node; a second current source; a second node to coupled to receive the second current source; and a second resistive element coupled between the first node and the second node, said second resistive element having substantially similar resistive characteristics to that of the first resistive element.