| 摘要 |
The invention relates to an analog filter (IF) including at least one filter stage (FSTi) having an input terminal (INi), an output terminal (OUTi) and an impedance network (INET') connected between said input and output terminals (INi, OUTi) and ground (GND), said impedance network (INET') having arranged three impedance elements (La, Lb, Lc, G2, G3, G4) in a Delta-configuration, such that a first node (N1i) of the Delta-configuration is connected to the input terminal (INi), a second node (N2i) of the Delta-configuration is connected to the output terminal (OUTi) and the third node (N3i) is connected to ground (GND). Optionally, a capacitive network (CNET) is inserted between said third node (N3i) and ground (GND). Using the star-delta transformation parasitic nodes, in particular purely resistive nodes in the filter transfer function when gyrators are used to replace inductances, are avoided since each inductance connection node (N1i, N2i, N3i) is respectively connected to a capacitive element (C1, CNET, C5). |
