A wideband 10-bit, 20 Msps pipelined ADC using current-mode signals

作者: P. Real , D.H. Robertson , C.W. Mangelsdorf , T.L. Tewksbury

DOI: 10.1109/4.90063

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摘要: A 10-b BiCMOS analog-to-digital converter (ADC) is used to demonstrate a current-mode pipeline system that overcomes some of the limitations high-speed multiple-flash architectures. Although multistage ADCs are efficient in both die area and power, track-and-hold amplifier (T/H) required prevent input from changing while conversion taking place. If ADC pipelined (operating on more than one sample at time), T/H between each stage. Additionally, for resolution greater about 8 b interstage amplification required. The settling behavior T/Hs amplifiers dominates performance these ADCs. To address problems, differential architecture incorporates T/Hs, obviating need amplifiers. prototype chip achieves 10 20 Msample/s with an 80-MHz bandwidth dissipates 1 W. >

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