A CMOS inverter-based approach to exponential pulse generation

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Date

2020-05-08

Authors

Liu, Edward

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Abstract

The growing complexity of electrical systems has led to an increasing amount of wiring needed for many of these systems. For instance, in modern cars, the total length of electrical wiring easily exceeds 1 kilometer. Therefore, fast and accurate ways of testing for wiring faults become necessary. One way to detect a wiring fault is with time domain reflectometry, where fault locations can be detected by observing the reflections of an input pulse. However, due to dispersive effects, the pulse shape and speed will change while propagating down the line. Therefore, the choice of pulse shape is important in achieving high accuracy.

In this thesis, we present a CMOS inverter-based circuit for generating a pulse with an exponential leading edge. The key property of the exponential function is that it stays exponential when differentiated or integrated. In that way, dispersion can be minimized. Additionally, as process, voltage and temperature (PVT) present reliability issues in practical design, we also present circuits that are used to stabilize critical parameters.

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