抄録
A design of low-frequency current-mode continuous-time filters for low-voltage and low-power appli-cations using complementary current mirrors is presented. When we realize low-frequency current-mode active filters, the time constant RC becomes quite large which can not be realized by passive elements in a monolithic integrated circuit. In this paper, negative feedback technique is used to realize the low-frequency current-mode filters. Since the filters consist of integrators as active elements, the proposed method can be used for a wide range of application. The filters can operate with a 1.5V power supply, thus they can be applied for portable equipments which are driven by a single battery. A third-order leapfrog filter with the castoff frequency of 8kHz is designed as an example and simulated by SPICE using a standard bipolar parameter set. The results show good performance in frequency characteristics.
