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On-Chip Time-Domain Metrology in Submicron CMOS
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ISBN: 365930820X
Author: Lin, Chin-Hsin
Condition: New
As the complexity and operational speed of today's Systems-on-Chip increase, measuring and characterizing SoCs building blocks are becoming more challenging. Embedded measuring techniques for system characterization, such as built-in self-test, are therefore becoming necessities. A Time-to-Digital Converter (TDC) is a device that has been widely used to measure the time intervals between two signal edges. The measurement resolution of a simple TDC architecture is limited by the minimum gate delay in the IC fabrication process. When the required time measurement resolution is smaller than the minimum gate delay, many TDC architectures include Time Difference Amplifiers (TDA) to pre-amplify the very short input time intervals. However, the gain of the TDA is usually sensitive to process, voltage, and temperature variations. This work researches techniques on improving measurement characteristic of TDCs and demonstrates a single-stage Vernier TDC with a constant gain TDA. The final designed TDC architecture achieves a linear measurement with a 2.5ps time resolution.
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On-Chip Time-Domain Metrology in Submicron CMOS