二阶多功能电流模式滤波器的设计

大连东软信息学院毕业设计（论文）AbstractDesign and Implementation of Second OrderMultifunctional Current Mode Filter Based onCMOSAbstractWith the rapid development of integrated circuits and the emergence of high-powerelectronic devices,in order to solve the obstruction of harmonic interference,filter is anindispensable device,which has a great impact on the performance of integrated circuitproducts.It can be said that where there are electronic products,there must be filter products.In this paper,the structure of current transmitter is analyzed,and a second generationcurrent transmitter circuit (CCCII)based on operational amplifier and buffer is designed.Compared with the previous circuit,this circuit has the advantages of low voltage,low powerconsumption,small transmission error of voltage and current,high bandwidth and adjustableharmonic filter gain,Finally,a second-order multifunctional current mode filter circuit iscomposed of multi output second-generation current transmitter (MOCCCID)and CCCIIcircuit.The circuit can realize four filter functions of low-pass,high pass,band-pass and bandstop at the same time.Through analysis and simulation,the designed circuit can pass thesignal below the cut-off frequency (1.21MHz)from 100kHz to 100MHz by adding 3.3Vpower supply voltage at room temperature,and the signal above the cut-off frequency can beattenuated to very low-pass filtering;The signal above the cut-off frequency (1.21MHz)passes through,and the signal below the cut-off frequency attenuates to a very low high passfilter;Let the signal in the range of 7.42KHz-4.66MHz attenuate to very low band-passfiltering through signals in other ranges;Let most of the signals pass through.The signal inthe range of 7.42KHz-4.66MHz attenuates to a very low band stop filter,and the centerangular frequency is 1.83MHz.The gain of the filter can be adjusted by changing the value ofthe current source.It can be verified from the simulation that the circuit can realize therequired function.This design is completed in cadence environment,based on 0.35 um CMOS process devicelibrary,completed the construction and Simulation of the circuit,the design can work at roomtemperature and 3.3V power supply voltage,and the overall layout area is 29912.0307m2.Key words:Filter,Current transmitter,Low pass filter,High pass filter,Band pass filter,Band stop filter