Chopper stabilized bias unit element with binary weighted charge transfer capacitors
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United States of America Patent
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Jun 27, 2023
Grant Date -
Dec 1, 2022
app pub date -
May 31, 2021
filing date -
May 31, 2021
priority date (Note) -
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Abstract
A Bias Unit Element (UE) has a digital input, a sign input, and a chop clock. The sign input is exclusive ORed with the chop clock to generate a signed chop clock. Each Bias UE comprises a positive Bias UE and a negative Bias UE, each comprising groups of NAND gates generating an output and a complementary output, each of which are coupled to differential charge transfer lines through binary weighted charge transfer capacitors to a differential charge transfer bus comprising a positive charge transfer line and a negative charge transfer line. The chopped sign input enables the positive Bias UE when the sign bit is positive and enables the negative Bias UE when the sign bit is negative.
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