Portland State University. Department of Electrical and Computer Engineering.
W. Robert Daasch
Date of Publication
Master of Science (M.S.) in Electrical and Computer Engineering
Electrical and Computer Engineering
Integrated circuits -- Large scale integration -- Noise, Complementary metal oxide semiconductors
1 online resource (2, vii, 69 p.)
In recent years, strong demand for high-performance electronic products has fueled the need for high-speed and high-integration VLSI circuits. This demand is expected to continue growing in the future, which will lead to development of IC's that are much more compact and operate at higher frequencies. As a result. preserving signal integrity for proper IC communications becomes an increasingly difficult challenge. In this thesis, an understanding of IC noise in relation to IC packaging is sought. An IC package is modeled with sophisticated 3-D simulators to extract its corresponding parasitics. These parasitics. expressed in terms of resistance. inductance. and capacitance (RLC), are lumped into their RLC circuit equivalent. and are incorporated into VO circuits to form a simulatable IC noise model. In addition to SPICE analyses. the behavior of noise is modeled mathematically, and the results are compared to measurement. With sufficient understanding of IC noise behavior, two circuits are proposed to effectively control IC. noise. The first circuit is a modified VO circuit that monitors the local output switching condition. and intelligently adjusts its slew rate such that the VO can switch as fast as possible without jeopardizing noise performance. The second circuit is a PVT-compensation control circuit, which senses process (P), voltage (V), and temperature (T) variations, and compensates the VO circuit's current drive accordingly. This feature makes the VO circuits more robust under a range of environmental stress. From analyses and simulations, the proposed VO and PVT-compensation control circuits show great potential for IC noise control. They control IC noise to less than 10% variation between single and multiple simultaneous output switchings as compared to a conventional VO circuit with 56% variation. The proposed circuits also show potential for reduced power dissipation in the VO circuits by a factor of 3. Finally, applications of these circuits are discussed with respect to test and program time reduction as well as commonly used asynchronous circuit interface.
Lim, Chee How, "High-performance Input/Output Circuit for CMOS Integrated Circuit Interface" (1997). Dissertations and Theses. Paper 5313.