Noise_Module

Noise_Module - Noise Sources in VLSI Circuits CMOS Digital...

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Noise Sources in VLSI Circuits CMOS Digital Integrated Circuits Massoud Pedram Spring 2007 Dept. of Electrical Engineering – Systems University of Southern California
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On and Off Chip Clock Frequencies M. Pedram USC/EE
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Sources of Noise M. Pedram USC/EE
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Noise in Digital Systems Noise Signals may be corrupted due to Crosstalk One signal interfering with many factors: Power supply noise Crosstalk another signal Capacitive cross talk between RC lines on a chip Inter symbol interference Real noise (thermal and shot) Parameter variation I d d t d i bl Floating Driven Coupling between LC transmission lines Independent random variables Power supply noise Inductance and resistance of Near end Far end supply network cause voltage drops Spatial variation in the power distribution network M. Pedram USC/EE Temporal variation in the power supply voltage
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Noise Sources V K V V N N s NI = + The first component represents those noise sources that are proportional to signal amplitude e.g., crosstalk and signal-induced power supply noise The second component represents noise sources that are independent of M. Pedram USC/EE The second component represents noise sources that are independent of signal amplitude e.g., transmitter and receiver offsets and unrelated power supply noise
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Proportional and Independent Noise Sources Some of the noise sources are proportional to signal swing Some noise is independent f h i l i If you increase the signal swing, you increase the noise Crosstalk of the signal swing Receiver or transmitter sensitivity Inter symbol interference Signal return ratio (Z r /Z 0 ) Signal induced power supply Receiver or Transmitter offsets Independent power supply noise Need to cancel these sources of noise, not to overpower them noise Reference offsets M. Pedram USC/EE
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