Abstract
Filtering at low frequencies means use of inductors and capacitors of large values. When inductors are excluded, such as in active RC circuits and small acceptable values are assigned to the capacitances, the resistances must have large values. To avoid these, simulated resistors are used in a form of a combination of capacitors and switches. Using high frequency switching along with a tolerable value of a capacitance any practical value of the resistance can be achieved, thus practically eliminating the problem.
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Litovski, V. (2019). Parallel Active SC Circuit Synthesis. In: Electronic Filters. Lecture Notes in Electrical Engineering, vol 596. Springer, Singapore. https://doi.org/10.1007/978-981-32-9852-1_18
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DOI: https://doi.org/10.1007/978-981-32-9852-1_18
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