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A Polyphase Filter (PPF) is a kind of complex filter that avoids generating image frequency in a heterodyne transmitter. Its properties allow to achieve required selectivity, difficult or even impracticable with real filters in integrated circuits. However, its performance is notably affected by non-idealities although some of the most important have not been thoroughly analyzed previously in literature...
This paper describes SPICE-compatible macromodels to model the nonlinear behavior of operational amplifiers (Op Amp) and current feedback operational amplifiers (CFOA). The proposed macro-models include not only those performance parameters more important of the Op Amp and CFOA like the dynamic range, slew-rate, DC gain and gain-bandwidth product, but parasitic resistors and capacitors associated...
This paper proposes new pathological element-based active device models which can be used in analysis tasks of linear(ized) analog circuits. Nullators and norators along with the voltage mirror-current mirror (VM-CM) pair (collectively known as pathological elements) are used to model the behavior of active devices in voltage-, current-, and mixed-mode, also considering parasitic elements. Since analog...
This paper provides a novel configuration to design a multi-scroll chaotic oscillator employing unity-gain cells (UGCs). The inclusion of multi-breakpoints to create a high-order negative nonlinear resistor (NR) is realized by the parallel combinations of basic cells. The breakpoints are controlled with resistors and tuning with level shifters. The multiscroll chaotic attractor has been optimized...
A new implementation of Chua's circuit employing unity-gain cells (UGC) as the active building blocks to emulate the behavior of the nonlinear resistor (NR) and the grounded inductor is introduced. The breakpoints and slopes associated to the NR as well as the numeric value of the inductor can be adjusted by the control resistors. The proposed circuit is suitable for implementation with the commercially...
A novel topology to design a chaotic oscillator which is based on Chua's circuit, is proposed. The chaotic oscillator is realized with unity-gain cells, that is, the use of voltage followers (VF) and current followers (CF) to emulate the behavior of the two most important elements of the Chua's circuit: the active three-segment voltage controlled nonlinear resistor and the grounded inductor. Furthermore,...
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