An improved design approach for high order switched-capacitor band-pass filters
This paper proposes an improved design approach for high order switched-capacitor (SC) band-pass filters. The de-normalized LC filter prototype is obtained directly using the proposed approach. The signal flow graph (SFG) of the LC prototype is obtained using active ladder synthesis method. A new node scaling method for simplifying the signal flow graph of the filters is proposed. With the node scaling, the dynamic range of the filter is increased, and the frequency response of the filter becomes more precise. A 10th order all poles switched-capacitor band-pass filter is designed using the proposed approach. The simulated results prove the advantages of the proposed node scaling method.