Patent ID: 6535047
Filing Date: 2003-03-18
Classification: H03K

Abstract:
An apparatus, comprising:a single external impedance element having an impedance; a master circuit coupled to the single external impedance element and having impedance-generation devices to provide an impedance that substantially matches the impedance of the external impedance element to compensate an attribute of a circuit; a control circuit coupled to the master circuit to generate a reference impedance code based on a number of activated devices in the master circuit; a slave circuit coupled to the control circuit to receive a slave impedance code from the control circuit that is based on the reference impedance code and having devices that are capable of activation based on the received slave impedance code; and another plurality of impedance-generation devices coupled to the slave circuit and capable of activation, based on a number of activated devices in the slave circuit, to provide another impedance different from the impedance of the master circuit to compensate a different attribute of the circuit.