Method for determining IC voltage and method for finding relation between voltages and circuit parameters

A method, comprising:

• executing a static timing analysis (STA) according to a circuit design to obtain data of a critical path of the circuit design, and then generating a netlist according to the data of the critical path;
• executing a circuit parameter simulation and a Monte Carlo simulation with the netlist according to a regular voltage and prescribed parameters, and thereby obtaining a circuit parameter reference value and a variance of circuit parameter values;
• executing an adaptive voltage scaling (AVS) analysis according to a predetermined voltage range, and thereby obtaining a voltage-versus-parameter relation, the voltage-versus-parameter relation indicative of a number of times that each of circuit parameter deviations that are respectively associated with predetermined voltages within the predetermined voltage range is of the variance;
• and
• testing an integrated circuit (IC) according to the regular voltage to obtain a circuit parameter test value of the IC, and then determining an IC voltage supplied to the IC according to the voltage-versus-parameter relation and a value difference between the circuit parameter test value and the circuit parameter reference value.