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A continuous-time four-quadrant multiplier in subthreshold region is presented. Besides its simplicity, the structure features inherent process-voltage-temperature (PVT) variation cancellation while working under low voltage supply and dissipating an ultra-low power. The PVT variation was alleviated through an inherent log/ anti-log cancellation technique, making it as a good candidate for bio-potential acquisition systems. The input and output signals are currents resulting in a wider bandwidth and larger dynamic range compared with the voltage-mode counterparts. The circuit is versatile and can be configured as a modulator, frequency doubler, and linear variable gain amplifier as shown in theory and simulation results.