Patent ID: 6717455
Filing Date: 2004-04-06
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 and to shift the reference impedance code to generate a slave impedance code; a slave circuit coupled to the control circuit to receive the slave impedance code from the control circuit and having devices that activate based on the received slave impedance code; and another plurality of impedance-generation devices coupled to the slave circuit that activate, based on a number of activated devices in the slave circuit, to provide another impedance to compensate a different attribute of the circuit.