HIGH-PASS SHAPED DITHER IN CONTINUOUS-TIME RESIDUE GENERATION SYSTEMS FOR ANALOG-TO-DIGITAL CONVERTERS
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United States of America Patent
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Issued Date -
Feb 10, 2022
app pub date -
Jul 30, 2021
filing date -
Jul 30, 2021
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Abstract
Mechanisms for reducing or eliminating a quantization error caused by a quantizer of a continuous-time (CT) residue generation system are disclosed. In particular, systems and methods described herein are based on using a dither generation and injection circuit that can perform a high-pass filtering of the additive dither signal (i.e., a high-pass shaped dither signal). Using high-pass shaped dither signals is expected to improve quantizer linearity without significantly reducing the available error correction range. The applied dither may be particularly effective at minimizing signal-dependent distortion in ADC output spectrum caused by the quantizer when the quantization error cancellation accuracy may be insufficient.
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