PSPICE simulations of the proposed filter in Figure 2 were performed. The filter was designed with the parameters of its components as follows: VDDDA implementation by commercial available ICs, LT1228 [10] and AD830 [11], C1 = C2 = 1nF, R = 1kΩ, IB = 80μA. It yields the natural frequency of 99.545 kHz and quality factor of 1. The theoretical natural