Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1996-11-12
1998-09-15
Do, Diep N.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
324 7678, 324628, 3647241, 364485, 455 673, G01R 2316
Patent
active
058084630
ABSTRACT:
A method for measuring an adjacent channel power of a device under test (DUT) such as a radio transmitter. The method comprises the steps of performing a frequency conversion to convert a transmitting signal of the DUT to an intermediate frequency signal; sampling the intermediate frequency signal to convert it to a digital signal; resolving the digital signal into an in-phase component and a quadrature component by a quadrature detection; removing a high frequency component from each of the in-phase and quadrature components; executing a complex Fourier transformation for the in-phase and quadrature components to obtain a frequency spectrum; and computing the leakage power to the adjacent channel from the frequency spectrum.
REFERENCES:
patent: 4794556 (1988-12-01), Rader
patent: 4810960 (1989-03-01), Owen et al.
patent: 5323391 (1994-06-01), Harrison
patent: 5420516 (1995-05-01), Cabot
patent: 5504455 (1996-04-01), Inkol
"Digital MCA System Standard RCR STD-32," Research & Development Center For Radio Systems. First Edition; Mar. 1993. pp. 226-227.
Advantest Corporation
Do Diep N.
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