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Goal-lossy
frequency filter design The article propose the new easy-to-use method of frequency filter optimalization (presented in [1]) by using the numeric algorithm of the CAD software. Method allows to reduce the parasitic effect by spreading the losses defined by terminal resistances in leader RLC structure to the structure and consecutively it's transformation to active realisation by using the single op. amp biquadratic lossy blocks. Article propose also new, easy to use method of compensation the parasitic parameters of active elements to the final frequency filter characteristic. Article 1>> Article 2>> [1]HÁJEK, K. - SEDLÁČEK, J.: Lossy LC Ladder Prototypes and their use for ARC Filter Optimization. WSEAS TRANSACTIONS on ELECTRONICS,Issue3, Volume2, July 2005, pp. 94-99, ISSN 1109- 9445. |
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Parasitic influence of active elements
to basic biquadratics filter blocks Article describe the parasitic influence of 1st pole and of the output resistance of voltage feedback op.amp on the behaviour of basic Sallean-Key and FNDR (frequency negative depended resistor) biquadratics block. Determine the origins of a apparition of parasitic zero and show how to calculate and compensate this parasitic zero transfer. Article>> |
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The
Interactive Analog Signal Processing by PC Control Describe the design, realization and the measured results of the integral system for the analog high dynamic range signal processing. The integral system is compose of a high accuracy digitally controlled analog frequency filter, processor unit for the autonomy operations and interactive FFD (Frequency Filter Design Studio) software. Article>> More about project>> |
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Basic property of voltage
and current mode circuits Article is a theoretical overview of laboratory task in course on the Department of Radioelectronic at Brno University of Technology. The main subject is the explanation of basic terms like Slew rate (SR), Band-Width (BW), Explanation and behaviour of some dynamic effect of voltage feedback amplifier (VFA), current feedback amplifier (CFA) and operational transconductance amplifier (OTA). Article>> |
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Real parameters of operational
amplifier identification This article try to show the new way how to identify the basic parameters of op. amp models to performing a high accurate simulations. The idea is to compress the dynamic range of open loop frequency gain which goes up to 200dB and back determination of the open loop gain of measured op.amp. Article>> |
