A pseudo‐differential current‐reuse structure for opamp‐sharing pipelined analog‐to‐digital converters |
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Authors: | Tohid Moosazadeh Mohammad Yavari |
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Affiliation: | Integrated Circuits Design Laboratory, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran |
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Abstract: | In this paper, a power efficient pseudo‐differential (PD) current‐reuse structure is presented to alleviate the memory effects of opamp‐sharing in pipelined analog‐to‐digital converters. To implement the PD current‐reuse structure, a switched‐capacitor circuit is introduced for multiplying digital‐to‐analog converter, which has a slight modification compared with the conventional switching scheme with no power penalty. In the proposed multiplying digital‐to‐analog converter circuit, the common‐mode offset amplification of the PD structures is eliminated. Moreover, a PD current‐reuse amplifier is developed from the telescopic structure with an inverter‐based gain‐boosting circuit. The effectiveness of the proposed structure is evaluated in comparison with existing current‐reuse techniques. Copyright © 2014 John Wiley & Sons, Ltd. |
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Keywords: | current‐reuse opamp‐sharing structure pseudo‐differential pipelined ADCs low‐power low‐voltage switched‐capacitor circuits |
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