Through silicon via (TSV) is one of the most important devices for 3D ICs to enable vertical interconnection among stacking layers. Because two ends of a TSV are completely connected only after bonding, it is often thought that there is no way to monitor the quality of TSV before bonding. We present a novel TSV testing scheme by performing on-chip monitoring before bonding, using a sense amplification technique that is commonly seen in a dynamic random access memory (DRAM) circuit. By virtue of the inherent capacitive characteristics, faulty TSVs can be detected with little area overhead for the circuit under test.