Simple models and formulas characterizing pulse propagation over superconducting microstrip transmission lines are summarized. The models consider the phase velocity and attenuation coefficient of high-T/sub c/ superconducting microstrip lines. Two examples, one involving a high-bandwidth interconnect bus for a time-multiplexed fine-grained multiprocessor, and the other an electrical time-delay element in the femtosecond regime, are presented.>

The authors discuss the impact of the physical interconnection environment through which the concurrent processes among locally distinct computing nodes of large-scale multicomputer systems are coupled. The communication capabilities implied for massively parallel computing systems by fine-grain task partitioning and by fine-grained communications are discussed in detail. Wafer-scale and hybrid wafer-scale system technologies which would support such communications are described.>

Adaptive filters, employing the transversal filter structure and the least mean square (LMS) adaptation algorithm, or its variations, have found wide application in data transmission equalization, echo cancellation, prediction, spectral estimation, on-line system identification, and antenna arrays. Recently, in response to requirements of fast start-up, or fast tracking of temporal variations, fast recursive least squares (FRLS) adaptation algorithms for both transversal and lattice filter structures have been proposed. These algorithms offer faster convergence than is possible with the LMS/ transversal adaptive filters, at the price of a five-to-tenfold increase in the number of multiplications, divisions, and additions. Here we discuss architectures and implementations of the LMS/transversal, fast-converging FRLS filter, and lattice filter algorithms which minimize the required hardware speed. We show how each of these algorithms can be partitioned so as to be realizable with an architecture based on multiple parallel processors.

Delta modulation (DM) is an attractive method of analog-to-digital (A/D) conversion in applications where simple and economical designs must be realized without sacrificing conversion quality. This paper describes a new single-chip, bipolar integrated circuit delta modulator that maintains a high conversion resolution over a wide range of sampling frequencies and ambient conditions. Its high-speed operation (maximum sampling rates greater than 15 Mbit/s) is achieved with lower power requirements than with comparable discrete realizations. Low sensitivities to power supply and ambient temperature variations, achieved with a novel logic design, make this circuit useful in a telephone switching office environment and as a buildlng block for other linear and companded analog-to-PCM converters.