Topic
Digital electronics
About: Digital electronics is a research topic. Over the lifetime, 10354 publications have been published within this topic receiving 153532 citations.
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19 Jul 1999
TL;DR: The architectural details of a fine-grained programmable transistor array (PTA) architecture is described and its use in evolutionary experiments on the synthesis of both analog and digital circuits is illustrated.
Abstract: The paper describes the architectural details of a fine-grained programmable transistor array (PTA) architecture and illustrates its use in evolutionary experiments on the synthesis of both analog and digital circuits. A PTA chip was built in CMOS to allow circuits obtained through evolutionary design using a simulated PTA to be immediately deployed and validated in hardware and, moreover, enables a benchmarking and comparison of evolutions carried out via simulations only (extrinsic evolution) with the chip-in-the-loop (intrinsic) evolutions. The evolution of an analog computational circuit and a logical inverter are presented. Synthesis by software evolution found several potential solutions satisfying the a priori constraints, however, only a fraction of these proved valid when ported to the hardware. The circuits evolved directly in hardware proved stable when ported to different chips. In either case, both software and hardware experiments indicate that evolution can be accelerated when gray-scale (as opposed to binary switches) were used to define circuit connectivity. Overall, only evolution directly in hardware appears to guarantee a valid solution.
59 citations
01 Dec 1993
TL;DR: In this paper, the authors introduce a new set of relative costs of various basic gates, and reevaluation of the logic in the light of these new cost functions leads to ultrafast and compact designs.
Abstract: New quantum electronic devices such as resonant tunnelling diodes and transistors have negative differential resistance characteristics that can be exploited to design novel high-speed circuits. The high intrinsic switching speed of these devices, combined with the novel circuit structures used to implement standard logic functions, leads to ultrafast computing circuits. The new circuit structures presented here provide extremely compact implementations of functions such as carry generation and addition. The most significant impact of these circuits on the field of logic design is the introduction of a totally new set of relative costs of various basic gates; reevaluation of the logic in the light of these new cost functions leads to ultrafast and compact designs.
59 citations
01 Aug 1989
TL;DR: Recent progress in Josephson digital logic circuits is described, noting that changing the junction material from a lead alloy to niobium has dramatically improved process reliability, and that high-speed, low-power operations have been demonstrated at large-scale integrated-circuit levels.
Abstract: Recent progress in Josephson digital logic circuits is described. It is noted that changing the junction material from a lead alloy to niobium has dramatically improved process reliability, and that high-speed, low-power operations have been demonstrated at large-scale integrated-circuit levels. The first Josephson microprocessor, operated at 770 MHz, verified the potential of Josephson devices for future digital elements. The possibilities of the ultrafast Josephson computer, previously shelved because of a number of problems, are being actively reconsidered. The performance anticipated for Josephson digital circuits using high-temperature superconducting materials is also discussed. >
59 citations
TL;DR: It is shown that linear regulation can in fact reduce the effective supply impedance of digital circuits without increasing their total power dissipation.
Abstract: Despite their use in analog or mixed-signal applications, the high power overheads of traditional linear regulators (both series and shunt) have precluded their successful adoption in regulating the supply of energy-efficient digital circuits. In this paper, we show that linear regulation can in fact reduce the effective supply impedance of digital circuits without increasing their total power dissipation. Achieving this goal requires minimizing the static power dissipation of the regulator, leading to a push-pull topology (similar to the regulators demonstrated by Wu and Sanders, 2001, Poon et al, 1999, and Intersil, 1998) with comparator-based feedback and a switched source-follower output stage. Measured results from a regulator implemented in a 65 nm SOI test-chip verify that by using these techniques, regulation reduces the effective supply noise by ~30% while also enabling a slight decrease (1.4%) in total power dissipation.
59 citations
08 Feb 1996
TL;DR: In this article, the performance of a commercially viable SiGe-HBT technology is demonstrated in analog and digital communications applications, and the measurements show that circuits fabricated in this technology are capable of fulfilling application requirements for RF analog in the 1-5 GHz range and for high-speed digital circuits at or above the 10 Gb/s range, with potentially lower power, lower cost and higher reliability compared to other high speed/RF technology options.
Abstract: The performance of a commercially viable SiGe-HBT technology is demonstrated in analog and digital communications applications. The measurements show that circuits fabricated in this technology are capable of fulfilling application requirements for RF analog in the 1-5 GHz range and for high-speed digital circuits at or above the 10 Gb/s range, with potentially lower power, lower cost and higher reliability compared to other high-speed/RF technology options.
58 citations