Time-interleaved　analog-to-digital　converter　(TIADC)　is　an　efficient　way　to　achieve　higher　sampling　rate　for　medium-to-high　resolution　applications.　The　performance　of　a　TIADC　suffers　from　the　mismatch　errors　among　the　sub-channels.　This　paper　presents　a　method　to　estimate　the　channel　mismatches　using　the　sub-channels　output　data.　The　proposed　method　introduces　an　equivalent　transfer　function　for　each　channel　to　model　and　estimate　the　mismatch　errors.　A　Hybrid　filter　bank　(HFB)　structure　is　used　to　both　model　the　TIADC　and　reconstruct　the　desired　uniformly　sampled　sequence　based　on　the　perfect　reconstruction　conditions　of　the　HFB　system.　A　four-channel　12-bit　400MHz　TIADC　has　been　implemented　in　hardware　to　verify　the　proposed　calibration　method.　The　measured　results　show　that　the　Spurious-free　dynamic　range　(SFDR)　can　be　improved　up　to　74dB　after　being　corrected　with　64-tap　Finite-impulse　response　(FIR)　filters.