A signal level detector comprising and a Burst-Mode Trans Impedance Amplifier (BM-TIA) using the same. The signal level detector includes a level detector configured to detect peak voltage of an input voltage signal, a reference voltage generator configured to generate second reference voltage by receiving first reference voltage, a comparator configured to compare the peak voltage and the second reference voltage and output a discrimination value according to a comparison result, and a latch configured to store the differential output from the comparator, wherein the level detector and the reference voltage generator have differential amplifier in the same structure.