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This paper presents a design of residue amplification circuit (MDAC) used in the first 1.5-bit pipeline stage of an ADC, and the MDAC should meet requirements of a 100MS/s 14-bit pipeline ADC with 1.8V supply voltage. In order to obtain the corresponding performance, the circuits such as operational amplifier and bootstrap circuit are designed which could realize the objective of high-speed and high-resolution...
A 1-V rail-to-rail operational amplifier with a constant gain is presented in this paper. A feedback structure which provides the availability of using two differential pairs is employed to maintain the trans-conductance constant in the input stage. Moreover, the feedback-control trans-conductance circuit enhances the robustness of the operational amplifier since it needn't consider the matching of...
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