For the extremely high sampling rate and high resolution required for Terahertz (THz) communication, time-interleaved analog-to-digital converters (TI-ADCs) are being considered. However, in practice, mismatches between the parallel sub-ADCs degrade the system performance. In this extended abstract, we provide an overview of the effects of TI-ADC offset, gain and timing mismatches on the bit error rate (BER) of orthogonal frequency division multiplexing (OFDM) system.