This　paper　introduces　an　adaptive　semiblind　background　calibration　of　timing　mismatches　in　a　two-channel　time-interleaved　analog-to-digital　converter　(TIADC).　By　injecting　a　test　tone　at　the　frequency　of　half　the　overall　sampling　frequency　of　TIADC,　the　timing　mismatch　between　two　sub-ADCs　can　be　quickly　estimated　with　great　accuracy　without　affecting　the　normal　operation　of　the　TIADC.　The　estimated　coefficient　can　then　be　used　in　compensation　module　formed　by　a　fixed　structure　to　calibrate　the　timing　mismatches.　Simulation　results　demonstrate　the　effectiveness　of　the　proposed　estimation　and　correction　technique.