Integrated Model of Distributed Systems is used for specification and verification of distributed systems. In the formalism, a system is modeled as a set of servers’ states and agents’ messages. The operation of a system is modeled as actions converting global system configuration (a set of states and messages) to a new configuration. The formalism is used in Dedan verification environment, in ...

For the past few years, we have been researching a novel type of photodetector featuring distributed optical amplification. We call these devices traveling-wave amplifier-photodetectors, or TAP detectors. The distributed combination of gain and absorption seeks a larger efficiency while keeping a low optical power, thus avoiding saturation. In this paper, we present experimental results both of...

A Class-E/Fodd high power amplifier (PA) using the distributed active transformer (DAT) is demonstrated at 29MHz. The DAT combines the output power from four VDMOS push-pull pairs. The zero voltage switching (ZVS) condition is investigated and modified for the Class-E/Fodd amplifier with a non-ideal output transformer. All lumped elements including the DAT and the transistor package are modeled...

A two-stage fiber-based femtosecond amplification system is presented, based on chirped-pulse amplification in highly nonlinear regime. The amount of self-phase modulation is separately adjusted in each stage selecting the proper stretching ratio in order to compensate gain narrowing. Analytical design rules are validated using numerical simulations. Our experimental implementation leads to the...

Distributed circuits using transmission lines (T-lines) or inductors exhibit high gain-bandwidth-products (GBW), as required by broadband communication systems. In this paper, the design of non-uniform downsized distributed amplifiers (DAs) is explored. Conventional DAs employ a topology in which inductors or T-lines separate the gain stages, yet the output currents from individual stages combi...

Ever since its discovery, graphene bears great expectations in high frequency electronics due to its irreplaceably high carrier mobility. However, it has long been blamed for the weakness in generating gains, which seriously limits its pace of development. Distributed amplification, on the other hand, has successfully been used in conventional semiconductors to increase the amplifiers' gain-ban...

As the variety of applications, especially distributed multimedia applications, explodes, their requirements on communication-relevant tasks increase. Besides a communication architecture for dealing with traditional communication protocol processing, multicast features and security requirements have to be considered in an integrated manner. Therefore, a multicast-capable and security-aware com...

..-htracf —A high-speed CMOS comparator has been designed and fabricated using a standard 3pm process. A dynamic latch preceded by an offset-cancelled amplifier is used to obtain a response time of 43 ns. The offset-cancelled amplifier reduces the input-referred offset so that medium-resolution analog-to-digital converters (ADC’S) can be built with this comparator. The use of pipefining within ...

This paper presents an optimized three-cell Nonuniform Distributed Amplifier (NUDA) suitable for optoelectronic drivers in the Q band. is first NUDA of Darlington topology designed with 0.1µm GaAs pHEMT process a transition frequency fT 130GHz. Gate microstrip line sections, drain and active device sizes were to obtain high gain large bandwidth from Monolithic Microwave Integrated Circuit (MMIC...