QUADRATURE NOISE SHAPINGSAR ADC AND OPERATION METHOD THEREOF
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United States of America
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Issued Date -
Feb 13, 2025
app pub date -
Jun 21, 2024
filing date -
Jun 21, 2024
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Abstract
An analog-to-digital converter ADC includes a first successive approximation register analog-to-digital converter (SAR ADC) configured to convert an in-phase input signal to digital data using a first integrator, a second successive approximation register analog-to-digital converter (SAR ADC) configured to convert a quadrature input signal to digital data using a second integrator, and first to fourth sampling capacitors configured to transmit an output of the first integrator to an input terminal of the second integrator, and transmit an output of the second integrator to an input terminal of the first integrator when the first integrator and the second integrator integrate the sampled in-phase input signal and the quadrature input signal, respectively. The first and second SAR ADCs and the first to fourth sampling capacitors are driven according to an operation sequence of a sampling stage, a conversion stage, and an integration stage.
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