SUCCESSIVE APPROXIMATION TYPE A/D CONVERTER
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United States of America Patent
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Issued Date -
Oct 3, 2024
app pub date -
Mar 21, 2024
filing date -
Mar 28, 2023
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Abstract
A successive approximation type A/D converter includes: a capacitive D/A converter, and a buffer circuit configured to supply a reference voltage to the capacitive D/A converter, wherein the buffer circuit includes: a reference voltage source configured to generate a constant voltage, a first stage amplifier configured to amplify the constant voltage, an output buffer with a gain of 1 configured to receive a voltage according to an output voltage of the first stage amplifier, and a filter that is interposed between the first stage amplifier and the output buffer and acts on a signal directed from the output buffer to the first stage amplifier, and wherein a tail current of a differential amplifier of the output buffer is larger than a tail current of a differential amplifier of the first stage amplifier.
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