Graduate Thesis Or Dissertation
 

Suppression of substrate noise in a mixed-signal CMOS integrated circuit

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  • Substrate switching noise is becoming a concern as integrated circuits get larger and speeds get faster. Mixed-mode integrated circuits are especially affected as the substrate noise interferes with sensitive analog circuits resulting in limited signal to noise ratios. This thesis serves to study the cause of the noise at the point where it is generated to the way it propagates to the analog circuits, and presents several approaches to reduce the switching noise. In addition, it examines the substrate impedance as being a key element to successful and reliable design for low-noise CMOS mixed-signal integrated circuits. Utilizing the substrate lead inductance and current-variable capacitances through the use of guard ring diodes, resonant frequencies which provide a low impedance path to ground are created. These can be tuned to coincide with problematic noise frequency components or to cancel the pin and package resonance, thus suppressing noise and improving reliability.
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  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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