In this paper, a wideband vector-sum phase shifter with linearity enhancement technology is proposed to minimize error. The digital synthesizes the output phases by modulating and summing four quadrature signals. A common-source stage transformer-based matching network quadrature-all-pass filter (QAF) are utilized for signals generation within wideband. Besides, decrease influence of parasitics...

Two methods of computer-controlling an electronic instrument are described. One method employs a computer having as few as two digital-to-analog converters. A second method is shown which can be used if a 16line digital output is available. Features of either method include low cost, high accuracy and stability, low noise and ease of installation. (Submitted to Review of Scientific Instruments)...

We apply the 3-dimensional radiative transport code Wind3D to 3D hydrodynamic models of Corotating Interaction Regions to fit the detailed variability of Discrete Absorption Components observed in Si iv UV resonance lines of HD 64760 (B0.5 Ib). We discuss important effects of the hydrodynamic input parameters on these large-scale equatorial wind structures that determine the detailed morphology...

The analog to digital front ends of measuring instruments affect crucially the interpretation of the signals acquired from the real world into the digital domain and their back presentation. The signal processing in the digital domain due to its stability meets usually the requirements on the uncertainty of the measuring instruments easily. ADCs and DACs influence dominantly the accuracy of ins...

The orbit measurement and correction system of the LNLS synchrotron light source is presented. Recent changes to the system including the addition of 12 vertical correctors and the use of 16 bit DACs to control the corrector magnet power supplies have improved the vertical orbit repeatability from fill to fill from ±70 μm to ±3 μm. The improved resolution also allowed the implementation of auto...