An analytic input matching technique for low noise amplifiers (LNA) has been presented. This method has been developed to design of cascode LNA for millimeter wave applications in modern CMOS technologies. Unlike the conventional analytic matching , the accurate transistor model used in our analysis, leads to acceptable accuracy in this frequency range. The analysis results have been used in design of a 30GHz LNA for STMicroelectronics 90nm digital CMOS process. Simulation in foundry design kit shows excellent accuracy of proposed method in comparison with the conventional method. The designed LNA have 10dB power gain with 5mW DC power consumption.
In this paper, a heuristic core mapping algorithm for 2-D mesh topologies called Spiral is proposed. To compare the efficacy of the algorithm, the results of the proposed algorithm are compared with those of the genetic and random mapping algorithms. The experimental results of synthetic traffic profiles reveal that the Spiral algorithm improves the reduction in the energy consumption as well as the speed of performing application compared to those of the genetic algorithm mapping.
The stability of a new adiabatic circuit with inductive load is discussed. The adiabatic circuit generates quasi-sinusoidal waveform current with multiple power-supply voltages. SPICE simulation shows that this circuit is stable after damping oscillation. For the analytical discussion, we derive a matrix that connects charge, current, and voltage in the circuit. By using matrix theory and a physical consideration, it is proved that the absolute value of the eigen value of the matrix, which connects the initial voltage and current deviations from the equally-divided-stepwise mode with those after the charge-recycling process, is smaller than 1. Therefore, the voltage and current deviations become zero after many charge-recycling processes. The circuit might be useful for a DC-AC inverter in the power electronics.
New simulation technique, by the transmission line matrix method(TLM), of electromagnetic waves in dispersive cold plasma media is proposed. This technique exploits the dependence of the current density J and the electric field E, and the derivation of the ordinary differential equations (ODE) by the exponential fitting method. The TLM Model uses the standard symmetrical condensed node(SCN) with 12 principal ports and 3 additional ports in which we incorporate voltage sources to model the dispersive behavior of cold plasma media. To investigate the accuracy of this approach, reflection and transmission coefficients of non-magnetized plasma wall are computed. Also the far-zone scattering results of a cold plasma sphere are presented. All the obtained results, using the new modeling technique named JE-TLM are in good agreement with those of the theoretical ones.