A vertical-MOSFET-based digital core circuit with vector matching function is proposed for achieving high-speed and low-power operation. The circuit designs with both planar and vertical MOSFET model are performed under 180nm CMOS technology, and the circuit operation is verified by NanoSim hardware simulation. Comparing with the conventional planar MOSFET case, the power consumption of the vertical MOSFET based circuit achieves more than 30% reduction without dependence on operating frequency. Furthermore, as circuit delay time can be suppressed, the vertical MOSFET based circuit also achieves the much higher maximum operating frequency than the planar MOSFET case up to 360MHz under the exactly same simulation conditions. This proposed core circuit can be flexibly utilized not only as an independent vector matching circuit but also as a unit circuit in the multi-core vector matching system.