Power consumption, noise and Bode diagram measurement of active filters

This paper presents the measurement methods of power consumption, output noise spectrum and Bode diagram. The power consumption is measured through supply current using a `FLUKE 289 True RMS Multimeter´. The output thermal noise spectral density and Bode diagrams are measured using high-quality equipment consisting of `Network Analyzer HP 4195A´ and computer. The measured data are downloaded from Network Analyzer using GPIB interface bus and Matlab. The measured diagrams are plotted using HPGL format generated by Network Analyzer. The measurements are demonstrated on different examples of fourth-order band-pass (BP) active-RC filters realizations. The devices under measurement were realized using printed circuit boards. It was shown that the new design of filters with single amplifier shows better performance both regarding power consumption and noise than the cascade design.