In the fifth chapter , a new fully differential operational amplifier with voltage and current - mode negative feedback has been proposed , which can stabilize its quiescent operation point , using the characteristic of mos transistors which operate in the triode region acting as active variable resistor , a fully differential fourth - order chebyshev low - pass filter with tunable frequency and bessel low - pass filter with accurate group delay based on r - mosfet - c and operational amplifier has been designed 第五章:提出了一種新的既具有電壓共模負反饋又同時具有電流共模負反饋的全差分運算放大器電路,能較好地穩(wěn)定電路的靜態(tài)工作點,并應(yīng)用mos管工作在線性區(qū)可作有源可變電阻用的特性設(shè)計得到了截止頻率可連續(xù)調(diào)節(jié)的高性能r - mosfet - c 、運放結(jié)構(gòu)切比雪夫( chebyshev )和精確群時延值貝塞爾( bessel )低通濾波器。