In this study, a voltage-mode and a current-mode first-order ail-pass filter are presented, The voltage-mode allpass filter contains a single FTFN, a capacitor and two grounded resistors. The ail-pass filter uses less passive elements than the other all-pass filters in the literature. The current-mode filter also uses a single FTFN, a capacitor and three resistors. The output of the current-mode ail-pass filter exhibits high output impedance so that this property makes the circuit very attractive from the viewpoint of cascadability. The tracking error performance for the proposed filters is also examined. The theoretical results are verified by PSPICE simulations.