Impedance adjustment circuit for adjusting terminal resistance and related method

摘要

An impedance adjustment circuit for adjusting a terminal resistance includes a resistance evaluation unit and a terminal resistor unit. The resistance evaluation unit is utilized for evaluating a ratio of an off-chip resistor and a basic resistor to generate a control signal by a successive approximation method. The terminal resistor unit is coupled to the resistance evaluation unit, and is utilized for deciding a number of shunt basic resistors to provide a matched terminal resistance according to the control signal.