By Michiel Steyaert, Arthur H.M. van Roermund, Herman Casier
Analog Circuit layout includes the contribution of 18 tutorials of the seventeenth workshop on Advances in Analog Circuit layout. every one half discusses a selected to-date subject on new and necessary layout rules within the sector of analog circuit layout. each one half is gifted via six specialists in that box and state-of-the-art info is shared and overviewed. This ebook is quantity 17 during this winning sequence of Analog Circuit layout.
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Extra resources for Analog Circuit Design - High-Speed Clock And Data Recovery, High-Performance Amplifiers, Power Management
As shown in the example of Fig. 5, increasing the boost at Nyquist improves the vertical eye opening, until a maximum level is reached. This saturation is due to the growing of negative cursors in equation ( 2), caused by channel mismatch at lower frequencies. Besides ISI, crosstalk from adjacent channels can severely impair the transmission performances. To analyze the impact of the boost equalizer in case a crosstalk source is present at the equalizer input, the boost equalizer can be modeled as an RL Rs Cs Fig.
However, as shown in Fig. 3, the use of a digital loop filter introduces new challenges to the phase detector and VCO. In particular, the phase detector must be altered such that it produces a reasonably high resolution digital signal that represents the phase difference between the clock and data signals. The VCO must be altered such that it changes its instantaneous frequency according to a digital signal while still maintaining low jitter generation. For most applications, the achievement of a low power implementation is highly desirable, and low area is important for achieving low cost.
To this extent, eye opening monitors and LMS can be employed to optimize receiver performances, by finding the optimal sampling phase and thresholds even in case the duobinary shaping of the channel is not ideally achieved. 5 Conclusions The above analysis shows that equalization and clock recovery must be carefully defined taking into account communication standard requirements such as frequency drift, data pattern requirements, data encoding etc. Channel pre-shaping, either by analog boost equalizers or by duobinary signaling, reveals a general technique to simplify equalization requirements, but crosstalk may represent the ultimate limit due to the reduction of signal amplitude.