Time-interleaving (TI) is one of the promising techniques for extending the synthesizable frequency and bandwidth of the DACs. However, timing mismatch errors among the sub-DACs introduce spurious images in the TIDAC’s Nyquist band, thus degrading the TIDAC’s SFDR performance. In this paper, we consider a 4-channel TIDAC and present a pre-correction filter bank to correct for the images in the Nyquist band. A WLS approach for optimizing the coefficients is introduced. Simulation examples demonstrate that our technique is able to achieve 40 dB in-band SFDR improvement with 55-tap FIR filters.