Design and analysis of crossbar circuits for molecular nanoelectronics

Abstract

AbshacGWe consider crossbar structures for nanoelectronics from a circuit design perspective. Given the large design space and the many promising naootechnologics, we develop parameterized circuit models for quickly surveying the crossbar design space. We then present methods for implementing logic and memory in crossbars via a programmed decoder, Finally, we consider the implications of logic representation when mapping circuits to crossbars.

Memory Select Devices

“…One example of these sneak paths is shown in Figure 12.2. The impact of the sneak paths on the reading and writing operations of crossbar arrays has been analyzed in numerous papers [6][7][8][9][10][11][12][13][14].…”

Molecular electronics: from devices and interconnect to circuits and architecture

“…In this section, we examine a crossbar from a circuit design perspective [48] and expose both the strong and weak points of this paradigm. While much of this analysis is applicable to several nanotechnology approaches based on regularly structured circuits, we use the crossbar technology proposed by HP and UCLA for demonstrating ideas at the circuit level [3], [43], [44], [49], [50].…”

“…We simulated the crossbar adder using the devices models in Fig. 12 to investigate [48]. We expect that a crossbar circuit with this arrangement will have inherent signal integrity problems; we also explore the effect of increasing the supply voltage as a method to boost .…”

“…However, for memory, this scheme incurs the problem that programming the crosspoint memory via the decoder may overwrite the programmed decoder. To avoid this scenario, we propose a decoder plane consisting of junctions that are programmed at different voltages than the crosspoint array [48]. We feel such an implementation is feasible, since the borders between the decoder and the crosspoint array are not constricted by nanoscale features.…”

Molecular electronics device modeling for system design

“…Fully functional nano-circuits such as molecular memories [2] and logic gates [6]- [8] have already been demonstrated in the lab, but a system architecture that allows efficient communication between submodules and with external circuits is required for a complete nanoelectronics system. One of the most promising architectures is a crossbar scheme [9]- [13] -an abstract representation of which is shown in Fig.3 -due to its advantages in size, fault tolerance and easy fabrication. While there have been significant efforts aimed at investigating the nano-scale crossbar architecture at the device and architectural levels, little consideration has been given to the intermediate levels of abstraction.…”