《Design Techniques for Low-Power Multi-GS/s Analog-to-Digital Converters》
作者:Tao Jiang
简介:Ultra-high-speed (>10GS/s), medium-resolution (5~6bit), low-power (<50mW) analog-to-digital converter can find it application in the areas of digital oscilloscopes and next-generation serial link receivers. There are several challenges to enable a successful design, however. First, the time-interleaved architecture is required in order to achieve over 10GS/s sampling rate, with the trade-off of the number of the channels and the sampling rate in each channel. Phase misalignment and channel mismatch must be considered too. Second, timing accuracy, especially dynamic jitter of sampling clock becomes a major concern at ultra-high frequency, and certain techniques must be taken to address it. Finally, to achieve low power consumption, Flash architecture is not suitable to serve as the sub-ADC, and a low-power sub-ADC that can work at relatively high speed need to be designed.;A single channel, asynchronous successive approximation (SA) ADC with improved feedback delay has been fabricated in 40nm CMOS.
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