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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)
—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 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)
This paper presents an intermodulation distortion measurement system based on automated feedforward cancellation that achieves 113 dB of broadband spurious-free dynamic range for discrete tone separations down to 100 Hz. For 1-Hz tone separation, the dynamic range is 106 dB, limited by carrier phase noise. A single-tone cancellation formula is developed(More)
Barium Strontium Titanate (BST) thin films have a permittivity that is dependent on applied electric-field. As electronically tunable lumped capacitors they can be used as microwave varactors in phase sbifters, tunable filters, and delay lines. Generally BST films are deposited on single crystalline substrates. This paper reports on the microwave properties(More)
Reduced-order modeling of distributed structures for transient and steady-state circuit simulation transforms discrete frequency-domain network parameters to a set of rational functions. The models are ideally causal and passive with passivity being the most difficult property to assure, especially when the distributed structures incorporate propagation(More)