Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1987-02-19
1989-04-04
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
364485, G01R 2316
Patent
active
048189316
ABSTRACT:
A vector analyzer incorporates a set of five types of markers for the display, which facilitate the visual analysis of the magnitude, phase and time relationships of the I and Q components of the modulation states displayed. The five markers are: an I marker, a Q marker, a magnitude marker, a phase marker and a time marker. The I and Q markers indicate amplitude in the I and Q coordinates displayed on the X-Y displays. The magnitude marker indicates amplitude on the radial coordinate of the X-Y displays. The phase marker indicates relative phase on the angular coordinate of the X-Y displays. The time marker indicates the time coordinate on the displays, and controls the time instant displayed. The analyzer also incorporates a circuit for performing linear transforms on the I, Q, and time data which allows real time adjustment of the sampled signals and enables the signals to be displayed in a three dimensional projection mode. The linear transform can be used to correct the display for three common sources of error in vector modulated signals: amplitude imbalance, phase errors, and quadrature errors. After the display has been corrected, the correction factors are a measure of the errors in the input signal, or in the device demodulating the input signal.
REFERENCES:
patent: 4257104 (1981-03-01), Martin et al.
patent: 4306186 (1981-12-01), Nakazawa et al.
patent: 4660150 (1987-04-01), Anderson et al.
Grau Juan
Naegeli Andrew H.
Nyquist Richard A.
Arana Louis M.
Hewlett--Packard Company
Perkins Bradley A.
Tokar Michael J.
Williams James M.
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