| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 91 === The design of active filter circuits by using current conveyor with high performance has received much attention. The main research designs the nth order universal filter that uses Second generation Current Controlled Conveyors(CCCIIs) in the thesis. The characteristic of CCCII provides wide tunable range of their intrinsic resistance that is more suitable for monolithic integration and more helpful for easy circuit design. In the thesis, the author employs the minimum components, only n CCCIIs and only n grounded capacitors, to realize an nth-order current-mode universal filter structure which can simultaneously realize lowpass, bandpass, highpass, bandreject and allpass filtering signals form the same configuration.
Three approaches to design the nth order universal filter. The first approach of design uses the induction method, which is to construct a second-order model first, a third-order model ….. , and induce to an nth-order circuit structure final. The second approach is to use the signal flow diagram to do the approach of filter circuit design. The third approach is to use the multiloop feedback concept to realize the nth order universal filter. The nth order universal filter circuit has the minimum active and passive components and give five different generic filtering signal simultaneously from the same configuration.
HSPICE simulation with use the process parameter of UMC05 LEVEL49 validates the proposed circuit structure. It can type out the proposed filter in an integrated form through layout and post simulation. PSPICE simulation is also used in the thesis that is helpful in the theoretical design.
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