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Article title STRUCTURAL OPTIMIZATION OF PRECISION ARC-FILTERS BASED ON MULTIDIFFERENTIAL OP AMPS
Authors S.G. Krutchinsky, E.A. Zhebrun
Section SECTION II. TELECOMMUNICATION, ELECTRONICS AND NANOTECHNOLOGY
Month, Year 04, 2015 @en
Index UDC 621.372
DOI
Abstract To improve the basic quality indicators of optimal by the criterion of a minimum sensitivity passive filters as IP blocks of mixed microelectronic systems the application of the principles of self-compensation and cancellation of operational amplifiers (op amps) unity gain frequency (f1) impact on the frequency and attenuation of the pole of the second order sections is considerated. Functional and topological rules of synthesis of such AF structures are formulated. It is shown that the effects of cancellation of separate op amp unity gain frequency on these parameters is achieved by introducing two autonomous special compensating feedbacks. The expediency of using in the circuitry of second-order sections of multidifferential op amps ensuring the implementation of special adders with different transfer ratios without the use of additional active elements is shown. In this case, the basic topological feature of compensating circuits is to unite the differential op amp inputs with auxiliary input of multidifferential op amp. It was found that for pole frequency error compensation in additional circuit there must be a positive recurrent attitude in the implementation of the op amp of bandpass function type, and for attenuation error compensation there must be a negative recurrent attitude and implementation of low pass filter function at a similar op amp output. Formulated principle leads to cancellation of the effect of different op amp frequency unity gain on the basic parameters of the second-order section and a filter as a whole. An example of structural synthesis of the universal second-order section with low (approximately in two orders of magnitude) current consumption and low influence of the unity gain frequency of applied op-amps on pole parameters. Demonstrated the use of a developed scheme for the design of optimal by the criterion of a minimum sensitivity bandpass 4th order filter. The simulation results of demonstrated circuits in an environment of industrial CAD are in good agreement with the basic theoretical propositions and conclusions.

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Keywords Structural optimization; precision filters; inherent compensation and cancellation.
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