FDT-a design tool for switched capacitor filters

The authors present FDT (filter design tool), a complete design tool for switched-capacitor filter synthesis from specifications to circuit schematic generation. The tool supports both ladder and biquad structure synthesis. It provides analysis and optimization capabilities at both pole-zero level and circuit level. It also extends these capabilities for noise calculation and noise minimization of the synthesized filter. These facilities together with a completely interactive and flexible user interface provide an efficient design tool for filter synthesis and design evaluation in a short time. FDT was successfully used in the design of a high-pass filter and two delay equalizers in an analog interface chip.<>