A corrected microwave multisine waveform generator

Abstract

This paper proposes a solution for one of the major difficulties associated with arbitrary waveform generation at microwave frequencies: the nonideal RF circuits used for signal generation. It presents a practical implementation of a RF multisine signal generator that corrects for the linear and nonlinear impairments identified with its output RF circuitry. The integration of an adaptive predistortion algorithm with a previously presented methodology for multisine synthesis with prescribed higher-order statistics, proved the feasibility of a simple microwave arbitrary waveform generator that meets the aims of previously developed signal synthesis theory.

Fast Nonlinear Analysis of Reconfigurable Microwave Systems by a Behavioral Model of MEMS Switches

“…Figs. [4][5][6] show some details of the filter response with the switches set for a 30 GHz passband (C1, C4 non-actuated, C2, C3 actuated). The inphase and quadrature components ofthe output signal as computed by nonlinear simulation and by the behavioral model are compared in figs.…”

“…ANN2 is excited by the filtered component of the signal (4) whose spectrum falls inside the mechanical passband BW as explained above, and computes the deviation of the MEMS capacitance C(t) from its equilibrium value Co(t). If we denote by s(t) the input signal, and let D(t) = C(t) -Co(t), the I/0 map ofANN2 is (6) In order to build a suitable training set for ANN2, we compute by the nonlinear technique outlined in section II the MEMS switch response to an input signal consisting of an RF carrier modulated by a band-limited Gaussian noise of band 2 BWM (approximated by a multisine function [6]). The analysis is repeated for several different values of noise spectral density and of bias voltage, in any combination.…”

A new method for wideband characterization of resonator-based sensing platforms

“…However, the circuit design for multisine generation is very complicated, especially at high frequencies. 26 A multisine signal provides wideband excitation but its spectrum is discrete and will therefore be resolution limited and ill-suited for high Q resonators.…”

Designing Multisine Excitations for Measurement of Modern Wireless Communication System

“…Similar approaches have also been studied and proposed for multisines with minimum crest factors, a goal also statisfied by controlling the phase and amplitude arrangements. However, those theoretical results become of limited practical value, unless the laboratory generation schemes allow the designed phase relation between the tones to be unaltered throughout the generator's RF path [5]. And another limitation of this method is the expensive computation cost of matching the higher order signal statistics even with small amount of tones.…”