Doctoral Dissertations

Keywords and Phrases

3D heterogeneous processor; BCH decoder; Gate diffusion input; Null convention logic; Stochastic computing


"In this research work, a suite of approaches are presented to improve reliability of 3D heterogeneous processors (3DHP) and to reduce the area overhead of asynchronous designs. This work is primarily divided into two parts. In the first part, we present an approach for improving reliability in 3DHP. Typically, in 3DHP, thermal hotspots introduce spatial and temporal variability that results in wide bit error variation in DRAM dies. To address this issue multi- path BCH decoder is introduced. Based on the thermal gradient data generated by on-chip temperature sensors, the proposed methodology specializes in adaptively estimating the number of errors in the incoming word and also selecting the fast decoding path to correct these errors. Thus, provides DRAM error protection with minimal decoding latency. In the next part of this work, we focus on reducing the area overhead of asynchronous paradigm-driven null convention logic (NCL) design using Gate Diffusion Input (GDI). We first develop technique for realizing NCL gates. In the process, we demonstrate that there is a voltage swing at the output that may introduces errors. To address this limitation, a HYBRID approach is introduced where conventional complementary metal oxide semiconductor (CMOS) technology is integrated with GDI methodology. With this approach, we demonstrate that we can reduce the transistor count (TC) of the NCL designs while addressing the limitations due to voltage drop. To further reduce the TC of the NCL designs, GNCL is developed. This approach utilizes the regenerative buffers to overcome the performance degradation and also reduce the area overhead. Overall in this dissertation, we demonstrate reductions in area and power overheads for asynchronous designs"--Abstract, page iv.


Choi, Minsu

Committee Member(s)

Beetner, Daryl G.
Sedigh, Sahra
Stanley, R. Joe
Saifullah, Abusayeed


Electrical and Computer Engineering

Degree Name

Ph. D. in Computer Engineering


Missouri University of Science and Technology

Publication Date

Spring 2020

Journal article titles appearing in thesis/dissertation

  • Adaptive multi-path BCH decoder to alleviate hotspot-induced DRAM bit error variation in 3D heterogeneous processor
  • Novel area-efficient null convention logic based on CMOS and Gate Diffusion Input (GDI) hybrid methodology
  • A low power design technique for the asynchronous null-convention logic circuits
  • Energy-performance scalability analysis of a novel quasi-stochastic computing approach


xiii, 108 pages

Note about bibliography

Includes bibliographic references.


© 2020 Prashanthi Metku, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11684

Electronic OCLC #