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• W2034672949 startingPage "346" @default.
• W2034672949 abstract "The Tarmy–Ghausi (TG) active resistor–capacitor (RC) filters using op-amps and its modification by Moschytz are well known to active RC filter designers. These use first-order all-pass networks in a negative feedback loop. New current-mode universal operational transconductance amplifier-capacitor (OTA-C) biquad filters based on the TG active RC filter are considered here. These are based on a recently proposed OTA-C based first-order all-pass network. Three different feedback arrangements are investigated in the proposed filter structure so as to reduce the pole-Q sensitivity. The proposed biquad filters are shown to implement all different types of filters like low-pass, high-pass, band-pass, symmetric notch, all-pass, low-pass notch and high-pass notch. The synthesis of the general biquad is carried out in a novel way by invoking the analogy with direct-form digital filter structures. The special case of all-pass filter realisation derived from the proposed universal filter needs additional hardware for realising the feed-forward coefficients. Hence alternative OTA-C based all-pass filter implementations based on Mitra–Hirano and Gray–Markel second-order digital filter structures are derived in which the coefficients that are used to realise the denominator are shared in the realisation of numerator also. All the proposed circuits are compared with the other structures available in the literature. The simulation results of the proposed circuits are also presented." @default.
• W2034672949 created "2016-06-24" @default.
• W2034672949 creator A5000558524 @default.
• W2034672949 creator A5051565689 @default.
• W2034672949 creator A5088331338 @default.
• W2034672949 date "2010-01-01" @default.
• W2034672949 modified "2023-10-16" @default.
• W2034672949 title "Current-mode operational transconductance amplifier-capacitor biquad filter structures based on Tarmy–Ghausi Active-RC filter and second-order digital all-pass filters" @default.
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• W2034672949 doi "https://doi.org/10.1049/iet-cds.2009.0213" @default.
• W2034672949 hasPublicationYear "2010" @default.
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