A circuit realization of the voltage differencing gain amplifier(VDGA) only transconductance described in this paper. The newly defined elemen a combination of the voltage and the current controlled voltage amplifier: The advantage feature of the proposed element is that the important transfer characteristics are electronically tunable by means of external bias currents. As application example, the resistorless realization of voltage-mode biquad filter based on the proposed VDGA is also introduced. PSPICE simulation results of the proposed circuit and its application are given to confirm the theoretical analysis. Keywords: Voltage differencing gain amplifier(VDGA), Biquad filter, Resistorless realization, Voltage-mode circuit