Multi-Functional Active RC-Filter (BPF, LPF, HPF, RF) for Designing Specialized Gate-Array Master Chip and Frequency Selection Devices

We have developed and investigated the multi-functional active RC-filter's (ARCF) architecture on base of three differential difference amplifiers (DDA) and its modifications, which implement low pass filter (LPF), high pass filter (HPF), band pass filter (BPF) and rejection filter (RF). We have done a mathematical analysis for ARCF's circuit variants, which allow their parametric synthesis. There are results of LPF's, HPF's, BPF's and RF's computer simulation in MicroCap on DDAs' models AD830, which are implemented due to signal source's switch to one of six inputs and three outputs, from which this signal is outputted. The suggested ARCF is advanced for selection devices' development on specialized gate-array master chips. The proposed ARCF's architecture is special, because the pole Q-factor adjustment does not result in transfer ratio's and pole frequency's change.