Learn More
AN INCREASING NUMBER of integrated solutions involve the stacking of chips to reduce system size. You can find wire-bonded stacks of processors and memories in cell phones, PDAs, and flash cards. But is physical size of the system the only benefit of stacking chips? Does this minia-turization provide potential performance benefits? Until recently, practical(More)
An object-oriented microwave circuit simulation environment is described. The design of the program is intended to offer flexibility without sacrifying efficiency. Recent developments in object-oriented techniques and in C++ compilers are used to obtain a flexible and robust system ideally suited to the development of a global modeling strategy for the(More)
A nonlinear spectral analysis technique that enables digital communication system metrics; SNR, EVM and the waveform quality factor (ρ) to be related to in-band distortion spectrum is presented. System metrics are estimated from the measured output power and in-band distortion power. The estimated metrics are verified by direct measurements of each metric(More)
—The history of RF and microwave computer-aided engineering is documented in the annals of the IEEE Microwave Theory and Techniques Society. The era began with elaborate analytically based models of microwave components and simple computer-aided techniques to cascade, cascode, and otherwise connect linear component models to obtain the responses of linear(More)
—A statistical technique is presented for the characterization of spectral regrowth at the output of a nonlinear amplifier driven by a digitally modulated carrier in a digital radio system. The technique yields an analytical expression for the autocorrela-tion function of the output signal as a function of the statistics of the quadrature input signal(More)
—A state-variable-based approach to the impulse response and convolution analysis of distributed microwave circuits is developed. The state-variable approach minimizes computation time and memory requirements. It allows the use of parameter-ized nonlinear device models, thus improving robustness. Soliton generation on a nonlinear transmission line is(More)
of the local reference node concept coupled with steady-state and transient analyses using state variables allows the incorporation of unrestrained EM modeling of microwave structures in a circuit simulator. A strategy implementing global modeling of electrically large microwave systems using the circuit abstraction is presented. This is applied to the(More)
— Compact electrothermal modeling of lumped electrical devices and compact thermal modeling of volu-metric materials enables efficient electrothermal modeling of microwave circuits. The compact thermal model of the body of an X-band MMIC is based is based on analytical solutions of the heat diffusion equation in thermal sub-volumes. The model is(More)
— For the first time a state variable transient analysis using wavelets is developed and implemented in a circuit simulator. The formulation is particularly well suited to modeling RF and microwave circuits and is validated by considering a nonlinear transmission line. However, results indicate that still more research is needed to make this method(More)