Original scientific paperIn this paper general second-order low-pass and band-pass filter sections are presented. The voltage noise spectral density and Schoeffler sensitivity are calculated for the simple design procedure and for three different types of optimization. The optimization procedure is also done for the forth-order low-pass and band-pass filter. The resulting low noise and sensitivity is investigated using the RMS noise voltage and multi-parameter sensitivity measure. The optimization gives lower noise and lower sensitivity filters. All analyzes are performed using Matlab and Spice programming tools.Key words: Low-pass filter, Band-pass filter, Noise, Sensitivity, OptimizationOptimizirani NP i PP filtri drugog ičetvrtog reda. U radu su prikazane opće filtarske sekcije drugog ičetvrtog reda. Izračunati su spektralna gustoća napona šuma i Schoefflerova osjetljivost i to za jednostavan proračun te za tri različita tipa optimizacije. Optimizacija je takoer provedena za nisko propusni i pojasno propusni filtař cetvrtog reda. Dobiveni niski šum kao i osjetljivost ispitani su računanjem efektivne vrijednosti napona šuma i više-parametarske mjere osjetljivosti. Rezultati optimizacije daju filtre koji imaju manji šum kao i osjetljivost. Svi su proračuni izvedeni korištenjem programskih alata Matlab i Spice.
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