Switched capacitor filters with a row dominant nodal admittance matrix

摘要

AbstractStray capacitance insensitive switched capacitor filters are studied, whose nodal admittance matrix is row‐dominant for arbitrary capacitor values. Such filters have low passband sensitivities, because their transfer function is intrinsically bounded by 1, as is the case forLC‐filters. Furthermore, row‐dominant filters have the additional advantage that internal voltages are bounded by one, and reach this bound at each attenuation zero, which ensures optimal dynamic range. However, we show that the attenuation zeros of row‐dominant filters are located at the frequenciesz2with (z2)m= 1, wheremis smaller than or equal to the number of operational amplifiers. Therefore, such filters are not suitable for conventional filter applications. Two examples of such filters ar