Multiplying digital-to-analog converter and pipeline analog-to-digital converter using the same
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United States of America Patent
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Aug 11, 2015
Grant Date -
Jul 30, 2015
app pub date -
Oct 7, 2014
filing date -
Jan 24, 2014
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Abstract
A multiplying digital-to-analog converter (MDAC) with high slew rate and a pipeline Analog-to-digital converter using the same. The first set of capacitors for a first input terminal of the operational amplifier (op-amp) includes active capacitors coupling the first input terminal of the op-amp to a first enhanced reference voltage or a common mode terminal in accordance with first digital bits in an amplifying phase of the MDAC, and includes a feedback capacitor coupling the first input terminal of the op-amp to a first output terminal of the op-amp in the amplifying phase. The first set of capacitors contains M capacitor cells. The feedback capacitor between the first set of capacitors contains at most M/(2n) capacitor cells, where n is a number of effective bits provided by a first analog-to-digital converter generating the first digital bits for the active capacitors.
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