ACTIVE FILTER SYNTHESIS BASED ON MESH CURRENT EMULATION OF LC LADDER STRUCTURES

In a series of papers, [1]-[3], A. Câmpeanu and M. Naforniţă proposed a new active RC filter synthesis method based on mesh current emulation of LC ladder filter networks. Initially, the method was successfully applied to highpass and lowpass polynomial filters. This paper extends the method to the very important classes of lowpass and highpass finite-zeros (elliptic) filters. Based on the mesh current method, simple and systematic design rules are proposed, which permits a direct active RC filter implementation of the passive network. It is also outlined a method of reducing the number of amplifiers required. Some results obtained using circuit simulation show the efficiency of the method and the importance of the results. 1