Norton_bi_quad_filter

Published:2009/7/25 1:47:00 Author:Jessie | From:SeekIC

This circuit shows both sections of a dual Norton used to form a bi-quad filter. Figures 11-15B and 11-15C show the design equations and bias equations, respectively. Note that the basic circuit can be connected to provide three types of filter action. With type I, VO1 is a band-pass, and VO2 is a low-pass. With type II, VO1 is high-pass and VO2 is band-pass. With type II, VO1 is notch or band-reject, and VO2 is not used. Note that one section of the Norton is connected as a noninverting integrator (Fig. 11-14), and the other section is inverting. The circuit provides satisfactory operation up to about 2 MHz.



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