Verfahren und Vorrichtung zur Kompensierung des Gleichspannungsanteils und zur Korrektur des Quadraturfehlers einer Basisbandumsetzeinrichtung von Funkempfängern für ein zu detektierendes Empfangssignal

摘要

The method involves measuring baseband signals in the form of in-phase and quadrate-components. Correction values are obtained therefrom for a reception signal to be detected in the baseboard. The measurement probe measures signals of the same amplitude but different phase length. There must be at least 5 probes so that the error values due to the dc component and the quadrature errors can be compensated. A frequency correction signal of a GSM oriented mobile system is used as an extra signal with different phase lengths.