On the tuning of continuous-time integrated filters, including parasitic effects

The tuning of continuous-time integrated filters with nonideal integrators is investigated. Specifically, each integrator is assumed to include one nondominant pole. Finite DC integrator gains are ignored since it can be shown that tuning schemes can compensate exactly for this nonideality. Simulations show that the adaptive tuning approach considerably reduces parasitic effects by a judicious choice of zero placement. Thus, for high-frequency filters where the effect of nondominant poles is critical, tuning schemes that adapt zeros as well as poles should be employed. It was also shown that the choice of the desired transfer function influences how accurately the filter may be tuned. Specifically, it was found that having extra zeros at infinity allows an additional degree of freedom used to better cancel parasitic effects