Publication Type:

Journal Article

Source:

IEEE Transactions on Very Large Scale Integration (VLSI) Systems, Volume 22, Number 2, p.334-342 (2014)

Keywords:

analog built-in self-test scheme, analog signal routing, analogue processing circuits, built-in self test, Built-in self-test, Built-in self-test (BIST), Clocks, CMOS analogue integrated circuits, CMOS process, Current measurement, current-starved, delay, delay cells, delay measurement unit, distributed architecture, flip-flops, low bandwidth signal, on-chip voltages, oversampling ratio, quantization, semiconductor device measurement, Signal sampling, size 130 nm, subsampled signal pair, subsampling, time based all-digital technique, Voltage measurement

Abstract:

A scheme for built-in self-test of analog signals with minimal area overhead for measuring on-chip voltages in an all-digital manner is presented. The method is well suited for a distributed architecture, where the routing of analog signals over long paths is minimized. A clock is routed serially to the sampling heads placed at the nodes of analog test voltages. This sampling head present at each test node, which consists of a pair of delay cells and a pair of flip-flops, locally converts the test voltage to a skew between a pair of subsampled signals, thus giving rise to as many subsampled signal pairs as the number of nodes. To measure a certain analog voltage, the corresponding subsampled signal pair is fed to a delay measurement unit to measure the skew between this pair. The concept is validated by designing a test chip in a UMC 130-nm CMOS process. Sub-millivolt accuracy for static signals is demonstrated for a measurement time of a few seconds, and an effective number of bits of 5.29 is demonstrated for low-bandwidth signals in the absence of sample-and-hold circuitry.

Cite this Research Publication

Dr. Rajath Vasudevamurthy, Das, P. K., and Amrutur, B., “Time-Based All-Digital Technique for Analog Built-in Self-Test”, IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol. 22, pp. 334-342, 2014.

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