Method of reducing imbalance in a quadrature frequency...

Details Method of reducing imbalance in a quadrature frequency... Method of reducing imbalance in a quadrature frequency...

2006-05-24

2009-08-25

Nguyen, Simon D (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

C455S067140, C455S226100, C455S296000, C455S326000

Reexamination Certificate

active

07580680

ABSTRACT:
A method is provided for reducing imbalance in a quadrature frequency converter. A test tone generator controlled by an alignment controller supplies a test signal to the input of the frequency converter. A starting point is selected in a solution space addressed by I and Q corrections. The starting point comprises in-phase (I) and quadrature (Q) phase correction values. A test is then performed to determine the best direction of movement in the I/Q phase correction plane in order to reduce phase imbalance. The I and Q phase correction values are then moved in that direction towards a phase imbalance minimum.

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