VOLTAGE-MODE FILTERS WITH OUTPUT IMPEDANCE NEUTRALIZATION
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United States of America
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Dec 12, 2024
app pub date -
Jun 7, 2023
filing date -
Jun 7, 2023
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Abstract
A device comprises a differential voltage-mode filter circuit comprising first and second voltage-mode filter circuits, and a neutralization network. The first and second voltage-mode filter circuits each comprise a unity gain buffer having a nonzero output impedance. The neutralization network comprises a first neutralization impedance circuit which couples an input of the first voltage-mode filter circuit to an output of the second voltage-mode filter circuit, and a second neutralization impedance circuit which couples an input of the second voltage-mode filter circuit to an output of the first voltage-mode filter circuit. The neutralization network is configured to correct a frequency response of the first and second voltage-mode filter circuits by at least one of cancelling and compensating for at least one transmission zero of a transfer function of each of the first and second voltage-mode filter circuits, which results from the nonzero output impedance of the respective unity gain buffers.
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