Low sensitivity selective linear phase switched-capacitor filters with controlled group delay

A closed form solution is described for the construction of even degree selective linear phase bandpass distributed, digital or switched-capacitor filters. The SC realizations of these filters have been realized using classical distributed network synthesis methods, as well as voltage inverter switches (VIS). The main feature of this new approach is its ability to yield ideal transmission together with linear phase and almost constant group delay, at a set of prescribed frequencies distributed over the passband. Besides, it has the advantage of controlling the ratio of C_max/C_min of the resulting realizations. Illustrative examples are given