ACTIVE RC FILTER ARRANGEMENT FROM ONE OR MULTIPLE BANDPASS FILTERS WITH MULTIPLE COUPLING

摘要

In an active RC filter arrangement comprising bandpass filters (I, II) with multiple negative feedback, for use in ripple control systems, the temperature coefficient of the resistor network (2 to 5 and, respectively, 102 to 105) provided for the frequency adjustment of each of the bandpass filters (I, II) is adapted to the average temperature coefficient according to its magnitude, but with opposite sign, by designing one of the resistors (2, 102) as a thermistor, thereby largely compensating for the temperature influence that is predominantly exercised by the ambient temperature. IMAGE