| Citation: |
Ning Ning, Yu Qi, Wang Xiangzhan, Dai Guanghao, Liu Yuan, Yang Mohua. A Novel Clock Feedthrough Frequency Compensation forFast-Settling of Folded-Cascode OTA[J]. Journal of Semiconductors, 2006, In Press.
Ning N, Yu Q, Wang X Z, Dai G H, Liu Y, Yang M H. A Novel Clock Feedthrough Frequency Compensation forFast-Settling of Folded-Cascode OTA[J]. Chin. J. Semicond., 2006, 27(10): 1737.
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A Novel Clock Feedthrough Frequency Compensation forFast-Settling of Folded-Cascode OTA
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Abstract
Based on the minimum settling time (MST) theory and step-response analysis of the second order system in active switched capacitor (SC) networks,a novel clock feedthrough frequency compensation (CFFC) method for a folded-cascode OTA is proposed.The damping factor η is adjusted by using MOS capacitors to introduce clock feedthrough so that the OTA can obtain the MST state and thus achieve fast settling.Research results indicate that the settling time of the compensated OTA is reduced by 22.7%;as the capacitor load varies from 0.5 to 2.5pF,the improved settling time increases approximately linearly from 3.62 to 4.46ns;for VGA application,fast settling can also be achieved by modifying the MOS capacitor value accordingly when the closed loop gain of the compensated OTA varies. -
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