Area-efficient dynamic capacitor circuit for noise reduction in VLSI circuits
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United States of America Patent
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Aug 25, 2020
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N/A
app pub date -
May 22, 2019
filing date -
May 22, 2019
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Abstract
A dynamic capacitor circuit having a first passive capacitor, a second passive capacitor, a first terminal of the first passive capacitor and a first terminal of the second passive capacitor connected together to receive an input signal through a resistor. The input signal includes a noise signal component. An alternating current (AC) coupled inverting amplifier has an input connecting a second terminal of the second passive capacitor, the second capacitor coupling the input signal to the AC coupled inverting amplifier input. A conductive path couples an output of the AC coupled inverting amplifier to a second terminal of the first passive capacitor to balance out any noise signal component of the input AC signal at the connection. The dynamic capacitor achieves an amount of noise reduction in a reduced space without applying deep trench capacitors (DTCAP) where the DTCAP is a capacitance formed in a plane perpendicular to the substrate.
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