APPARATUS AND METHOD FOR CONTROLLING THE DYNAMIC RANGE OF DAC INPUT SIGNAL

摘要

An apparatus and a method for controlling a dynamic range of a DAC(Digital to Analog Converter) input signal are provided to optimize the performance of a DAC by actively controlling the DAC input signal according to the number of channels and operation scenarios. Diffused signals including a plurality of channel signals having predetermined digital gain values outputted by a PN diffuser(202) pass through a gain normalizer(204) before transmission to an LPF(Low Pass Filter)(206). The gain normalizer(204) normalizes the diffused signals of N + m bits with normalization factors in accordance with an input operation range of a DAC(210) to output normalized signals of N bits. The PN diffuser(202) generates the diffused signals of larger bits that is N+m bits by using the gain normalizer(204). The output of the gain normalizer(204) is filtered by the LPF(206) to be transmitted to an interpolator(208). The interpolator(208) interpolates the signals transmitted from the LPF(206) in consideration of the input operation range of the DAC(210) to provide the interpolated signals to the DAC(210). The DAC(210) converts the interpolated signals into analog signals and outputs the converted signals.