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Ð”Ð°Ð½Ð½Ð°Ñ Ñ€Ð°Ð±Ð¾Ñ‚Ð° поÑвÑщена поиÑку и иÑÑледованию методов ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð²Ð½Ð¾Ñимых потерь в Gm-C фильтрах. Из предÑтавленного обзора литературы по данной тематике можно Ñделать вывод, что оÑновными иÑточниками вноÑимых потерь в Gm-C фильтрах ÑвлÑÑŽÑ‚ÑÑ RLC прототип и ТУ. Ð”Ð»Ñ ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð¿Ð¾Ñ‚ÐµÑ€ÑŒ ТУ должен обладать доÑтаточно выÑоким выходным Ñопротивлением. Увеличить выходное Ñопротивление ТУ предлагаетÑÑ Ð´Ð²ÑƒÐ¼Ñ ÑпоÑобами: путем иÑÐ¿Ð¾Ð»ÑŒÐ·Ð¾Ð²Ð°Ð½Ð¸Ñ ÐºÐ°Ñкодной Ñхемы в выходном каÑкаде ТУ и размещением отрицательного ÑÐ¾Ð¿Ñ€Ð¾Ñ‚Ð¸Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿Ð°Ñ€Ð°Ð»Ð»ÐµÐ»ÑŒÐ½Ð¾ выходу ТУ. Потери приÑущие RLC прототипу предлагаетÑÑ Ñнижать путем ÑƒÐ²ÐµÐ»Ð¸Ñ‡ÐµÐ½Ð¸Ñ Ð·Ð½Ð°Ñ‡ÐµÐ½Ð¸Ñ Ð¿ÐµÑ€Ð²Ð¾Ð³Ð¾ ТУ при иÑпользовании баланÑной Ñхемы. Также в данной работе предÑтавлены результаты Ð¼Ð¾Ð´ÐµÐ»Ð¸Ñ€Ð¾Ð²Ð°Ð½Ð¸Ñ Ñхем Gm-C ФÐЧ 3-го порÑдка Ñ Ð´Ð²ÑƒÐ¼Ñ ÐµÐ¼ÐºÐ¾ÑÑ‚Ñми и Ð´Ð²ÑƒÐ¼Ñ Ð¸Ð½Ð´ÑƒÐºÑ‚Ð¸Ð²Ð½Ð¾ÑÑ‚Ñми. При Ð¼Ð¾Ð´ÐµÐ»Ð¸Ñ€Ð¾Ð²Ð°Ð½Ð¸Ñ Ð´Ð°Ð½Ð½Ñ‹Ñ… Ñхем на идеальных Ñлементах получены Ð·Ð½Ð°Ñ‡ÐµÐ½Ð¸Ñ Ð²Ð½Ð¾Ñимых потерь в – 6 дБ. Также был раÑÑмотрен метод ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð²Ð½Ð¾Ñимых потерь, оÑнованный на увеличении выходного ÑÐ¾Ð¿Ñ€Ð¾Ñ‚Ð¸Ð²Ð»ÐµÐ½Ð¸Ñ Ð¢Ð£. ИÑÑ…Ð¾Ð´Ñ Ð¸Ð· полученных результатов, увеличение выходного ÑÐ¾Ð¿Ñ€Ð¾Ñ‚Ð¸Ð²Ð»ÐµÐ½Ð¸Ñ Ð¢Ð£ до 1 МОм позволÑет Ñнизить вноÑимые потери до ÑƒÑ€Ð¾Ð²Ð½Ñ Ð² – 6 дБ, что ÑвлÑетÑÑ Ð¾Ð¿Ñ‚Ð¸Ð¼Ð°Ð»ÑŒÐ½Ñ‹Ð¼ результатом.
This work is devoted to the search and study of methods to reduce the insertion loss in Gm-C filters. From the presented review of the literature on this topic, we can conclude that the main sources of insertion loss in Gm-C filters are the RLC prototype and technical specifications. To reduce losses, the TA must have a sufficiently high output resistance. It is proposed to increase the output resistance of the TA in two ways: by using a cascode circuit in the output stage of the TA and placing a negative resistance parallel to the output of the TA. Losses inherent in the RLC prototype are proposed to be reduced by increasing the value of the first TA when using a balanced circuit. This paper also presents the results of modeling the Gm-C low-pass filter of the 3rd order with two capacitors and two inductors. When simulating these circuits on ideal elements, the insertion loss values of - 6 dB were obtained. Also considered was the method of reducing the insertion loss based on increasing the output resistance of the TA. Based on the results obtained, an increase in the output resistance of the TA to 1 MΩ allows the insertion loss to be reduced to a level of - 6 dB, which is the optimal result.
амплиÑÑдно-ÑаÑÑоÑÐ½Ð°Ñ Ñ Ð°ÑакÑеÑиÑÑика, gm-c filters, output resistance, ÑÑанÑкондÑкÑивнÑе ÑÑилиÑели, иммиÑаÑоÑÑ, ÑилÑÑÑÑ Ð½Ð¸Ð¶Ð½Ð¸Ñ ÑаÑÑоÑ, introduced losses, вÑÑ Ð¾Ð´Ð½Ð¾Ðµ ÑопÑоÑивление, вноÑимÑе поÑеÑи, rlc prototype, low frequency filters, amplitude-frequency characteristics, transconductive amplifiers, rlc пÑоÑоÑип, immitators, gm-c ÑилÑÑÑÑ
амплиÑÑдно-ÑаÑÑоÑÐ½Ð°Ñ Ñ Ð°ÑакÑеÑиÑÑика, gm-c filters, output resistance, ÑÑанÑкондÑкÑивнÑе ÑÑилиÑели, иммиÑаÑоÑÑ, ÑилÑÑÑÑ Ð½Ð¸Ð¶Ð½Ð¸Ñ ÑаÑÑоÑ, introduced losses, вÑÑ Ð¾Ð´Ð½Ð¾Ðµ ÑопÑоÑивление, вноÑимÑе поÑеÑи, rlc prototype, low frequency filters, amplitude-frequency characteristics, transconductive amplifiers, rlc пÑоÑоÑип, immitators, gm-c ÑилÑÑÑÑ
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