TUNING OF SECOND-ORDER CURRENT MODE FILTERS IN THE PRESENCE OF PARASITIC POLES
具有寄生极点的二阶电流模式滤波器的可调性

The characteristics of fully integrated filters would deviate from the desired values in the presence of parasitic poles. The effects of the finite DC gain and non-dominant poles of the integrators on filter perfomance are analyzed, deviation fomulas of pole frequency and quality factor for the second-order filters are given, and tuning of filter characteristic parameters is dealt with. Moreover, a gain-tunable current-mode continuous-time integrator is presented. Both fp and Q can be tuned with the filter based on the integrator.