This paper presents design algorithms for hybrid filter banks (HFB’s) for high-speed, high-resolution conversion between analog and digital signals. The HFB is an unconventional class of filter bank that employs both analog and digital filters. When used in conjunction with an array of slower speed converters, the HFB improves the speed and resolution of the conversion compared with the standar...

A bandwidth-efficient and low-cost spectral-null-filling scheme simultaneously delivering a 56-Gbps 4-level pulse amplitude modulation (PAM-4) digital signal 10 × 400-MHz analog radio frequency (RF) on single wavelength is demonstrated for high-capacity wired wireless optical access networks. The data rate of the PAM-4 consistent with next-generation passive network (PON), inherently provides s...

Coherent demodulation in digital wireless communications involves generating a local carrier that is in phase with the received carrier, and then using this local carrier in order to coherently demodulate the received signal. Generation of the local carrier is done via a carrier synchronization Phase Lock Loop (PLL). The receiver also includes a symbol timing synchronization PLL, whose purpose ...

This paper presents a novel approach to including non-instantaneous discrete control transitions in the linear hybrid automaton approach to simulation and verification of hybrid control systems. In this paper we study the control of a continuously evolving analog plant using a controller programmed in a synchronous programming language. We provide extensions to the synchronous subset of the Sys...

We propose a formalization of generic algorithms that includes analog algorithms. This is achieved by reformulating and extending the framework of abstract state machines to include continuous-time models of computation. We prove that every hybrid algorithm satisfying some reasonable postulates may be expressed precisely by a program in a simple and expressive language.

In this paper we propose an approach for testing time-domain properties of analog and mixed-signal circuits. The approach is based on an adaptation of a recently developed test generation technique for hybrid systems and a new concept of coverage for such systems. The approach is illustrated by its application to some benchmark circuits.

Exponentially weighted recursive least-squares (RLS) algorithms are commonly used for fast adaptation. In many cases the input signals are continuous-time. Either a fully analog implementation of the RLS algorithm is applied or the input data are sampled by analog-to-digital (AD) converters to be processed digitally. Although a digital realization is usually the preferred choice, it becomes unf...

The system approach in science and technology education is concerned mainly with continuous systems, whose behavior is described by differential and difference equations. However, in the digital era, the use of discrete systems becomes more and more popular. In particular, the design of hybrid systems—which combines digital and analog (continuous) subsystems—is receiving attention through compu...

Delta-sigma modulation for analog-to-digital conversion resolves a number of bits logarithmic in the number of modulation cycles, and linear in modulation order. As an alternative to higher-order noise shaping, we present an algorithmic scheme that iteratively resamples the modulation residue, by feeding the integrator output back to the input. This yields a bit resolution linear in the number ...

The least-mean-square (LMS) algorithm is an adaptation scheme widely used in practice due to its simplicity. In some applications the involved signals are continuous-time. Then, usually either a fully analog implementation of the LMS algorithm is applied or the input data are sampled by analog-to-digital (AD) converters to be processed digitally. A purely digital realization is most often the p...