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| TUNING OF SECOND-ORDER CURRENT MODE FILTERS IN THE PRESENCE OF PARASITIC POLES |
| Zhao Luhuai; Qiu Guanyuan |
| Xi'an Jiaotong University; Xi'an 710049 |
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Abstract 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.
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Received: 21 November 1996
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1998, Vol. 20 
