An electronically controllable universal fractional-order filter (FOF) is presented in this paper. The proposed FOF provides the response of fractional-order low-pass (FOLPF), high-pass (FOHPF), and all-pass filters (FOAPF) in a single topology. The proposed FOF topology uses single fractional capacitor (FC) and operational transconductance amplifier (OTA). The RC tree-based 12th-order continuous fraction expansion (CFE) is used to realize the FC. The simulation of proposed FOF is performed in Cadence TSMC 180-nm technology with a supply voltage of ± 900 mV. Layout of OTA is also presented which covers a chip area of 10.5 μm × 13.5 μm. The proposed circuit also offers electronic tunability through the bias current of OTA. Effect of variation in order is also observed for filter. The total power consumption is 153 mW. Simulation results are also confirmed through experimental results. An IC-based prototype using commercially available IC of CA3080 on a breadboard was created, and transient response for each filter is observed.