Method for determining imbalance in a vector signal modulator

Details Method for determining imbalance in a vector signal modulator Method for determining imbalance in a vector signal modulator

2007-02-20

2007-02-20

Tran, Khai (Department: 2611)

Pulse or digital communications

Testing

C455S067150, C455S067110, C455S067130, C455S114200

Reexamination Certificate

active

10301214

ABSTRACT:
A method of determining imbalance in a vector signal modulator. First and second channels of a vector signal modulator are stimulated with a multi-tone signal having a power versus frequency spectrum having numerous of frequencies. In response to the stimulation, an output of the vector signal modulator is measured. The first and second channels are simultaneously stimulated with a multi-tone signal having essentially the same characteristics as the one used when separately stimulating the channels. Data collected from both the separate and simultaneous stimulations are used to calculate imbalance versus frequency of the vector signal modulator. Alternatively, two channels of a vector signal modulator are simultaneously stimulated with first and second multi-tone signals. The first and second multi-tone signals have tones at main frequencies and at first and second offsets thereto, respectively. Output measurements are then made and imbalances are calculated.

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Tien-Yow Liu, et al.; “A Spectral Correction Algorithm for I-Q Channel Imbalance Problem”, date unknown.
Dr. Earl McCune; “Taming the Quadrature Modulator”; Spring 2000; pp. 1-10.

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