Switched-Current Wave Filters with Reduced Number of Current Inversions

Switched-current wave filters offer very simple structures, as their main building blocks are current mirrors. On the other hand, the achieved accuracy is mainly degraded due to the effect of MOS transistor parameters mismatch. In this Letter, new configurations of serial and parallel adaptors that are used in the simulation of inductances and capacitors of the LC ladder prototype are introduced. These have been implemented using an appropriate sharing of the delay that should be presented between the incident and reflected waves at a port of adaptor, and a 3-phase clocking scheme. The number of required current inversions and consequently the effect of mismatching are reduced in the proposed configurations.