Analog filters are typically implemented using matched components in order to reduce the influence of component errors as well as temperature and power supply voltage variations, etc. For example, special symmetric layouts of the amplifiers are used to reduce the spread of the performance parameters and achieve tracking over large temperature and power supply voltage ranges. Moreover, the temperature coefficient for the resistors and capacitances are chosen equal, but with opposite sign, so that the RC products become invariant with temperature.
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Wanhammar, L. (2009). Tuning Techniques. In: Analog Filters Using MATLAB. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-92767-1_11
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DOI: https://doi.org/10.1007/978-0-387-92767-1_11
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