開關(guān)電容V/Q變換器及其在接地阻抗模擬中的應(yīng)用
SWITCHING CAPACITANCE V/Q TRANSVERTER AND ITS APPLICATION IN GROUNDED IMPEDANCE SIMULATION
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摘要: 文中提出一個V/Q變換的廣義跨導(dǎo)概念,并應(yīng)用在開關(guān)電容阻抗模擬中。使用V/Q變換器,可以用電壓傳遞函數(shù)實現(xiàn)所希望的阻抗函數(shù)。由此概念出發(fā),分別導(dǎo)出了前差FD,后差BD和雙線性S/Z變換的三種接地開關(guān)電容頻變負(fù)阻SC-FDNR電路。如果所選用的電壓傳遞函數(shù)電路對雜散電容不靈敏,那么實現(xiàn)的模擬阻抗電路對雜散電容也是不靈敏的。作為文中的一個例子,用FD-FDNR電路組成一個諧振回路,實驗表明其頻響特性與理論分析相一致。Abstract: A concept of general transconductance of V/Q (voltage/charge) transformation i.. proposed, and applied to the simulation of switching capacitance impedance. By Using V/Q transverter, the expected impedance function can be implemented by means of volrage transfer function. Starting from this concept, the switched capacitor-FDNR (frequency dependent negative resistor) circuits of three kinds of S/Z transformation (i.e. forward differential SfZ transformation, backward differential S/Z transformation, bilinear S/Z transformation) are respectively deduced. If the selected voltage transfer function circuit is not sensitive to stray capacitance, then the implemented simulation impedance circuit is also not sensitive to stray capacitance. As an example, a resonant loop is composed of forward differential FDNR circuit. The experiments show that the characteristics of its frequency response coincide with the theoretical analysis.
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