A method for frequency and time synchronization of a receiver for receiving Orthogonal Frequency Division Multiplexing signals is described. The present invention describes a method of adapting conventional scan architectures into a low power scan architecture. Pads are disposed in a peripheral region formed around the active region and the pads are electrically connected to the photodiode units. A magnitude calculator receives the in-phase and quadrature digital values, and outputs a magnitude. 0, each of d1 and d2 being an indicator of a range of molecular weight distribution converted to polystyrene standard, wherein Mz, Mw and Mn are a z-average molecular weight, a weight-average molecular weight, and a number-average molecular weight of the binder resin, respectively.