A MEMS capacitive sensor is emulated on a PCB for quick validation of CMOS interface circuit. In capacitive sensor, capacitance changes with external force; to mimic similar changes, controlled magnetic field is applied on emulated PCB capacitor. The dimension optimizations of interdigital capacitor are performed using CST software. The simulated values are milled on a FR4 sheet to make PCB capacitor. The simulated capacitance values are cross checked by making measurement using LCR meter on PCB capacitor and have a deviation of 6.5%. The complete MEMS emulator consists of PCB capacitor, permanent magnet controlled by screw gauge and gauss meter. A minimum change of 50 aF achieved over a base capacitance 1.9 pF. © 2020 IEEE.