In this paper, a new CMOS current-mode single input and multi-output (SIMO) universal filter and quadrature oscillator (QO) based on current differencing transconductance amplifiers (CDTA) are proposed. The SIMO filter can realize low-pass, high-pass, band-pass band-stop and all-pass filter functions simultaneously without any component matching conditions and the angular frequency (ω o) and the quality factor of the proposed filter can be electronically controlled and tuned orthogonal. By some modifications of the filter, a new current-mode four-phase QO can be obtained easily. The condition of oscillation and frequency of oscillation of the QO can be controlled electronically and independently through the bias current of the CDTAs, and it is suitable for variable frequency oscillator. Moreover, all the passive and active sensitivities of the circuits are low. SPICE simulation results are included to confirm the theory.