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A low-voltage fully differential current-mode continuous time delta-sigma modulator is presented for application in electrochemical sensor arrays. Although a first order topology is realized by using a single differential integrator, second order noise shaping is achieved. A differential quantizer based on current controlled oscillators (CCOs) allows a current-mode implementation with high noise-immunity...
This paper presents a class-D power amplifier for medium quality sound systems using a second-order passive sigma-delta modulator (ΣΔM). The ΣΔM controls an output power stage consisting of a H-bridge. The loop filter of the ΣΔM was designed using a optimization procedure based on genetic algorithm (GA), that takes into account several parameters. This system was implemented using discrete components...
This paper proposes the evolutionary technique of the stimulus signal optimization for the analog electronic circuit testing purpose. The obtained signal is coded with Sigma-Delta modulation usage that allows to generate it easily by simple microcontrollers without the necessity of expensive D/A peripherals applying. The signal with the controlled impulses density may be obtained on the external output...
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