Orthogonality detector, and quadrature demodulator and...

Details Orthogonality detector, and quadrature demodulator and... Orthogonality detector, and quadrature demodulator and...

2011-04-05

2011-04-05

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S130000, C375S260000, C375S316000, C375S343000, C455S209000, C455S214000, C455S324000, C455S334000

Reexamination Certificate

active

07920652

ABSTRACT:
To detect phase mismatches between in-phase and quadrature signals of a quadrature demodulator. The phase mismatches can be detected using the signals obtained by removing high frequency components of output of a multiplier by a low pass filter, the output being the product of the in-phase signals of which low frequency components are removed by a first high pass filter by the quadrature signals of which low frequency components are removed by a second high pass filter.

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