Quadrature alignment in communications receivers

Details Quadrature alignment in communications receivers Quadrature alignment in communications receivers

2008-12-15

2009-12-01

Torres, Juan A (Department: 2611)

Pulse or digital communications

Transmitters

Plural diversity

C375S328000, C375S316000, C375S320000

Reexamination Certificate

active

07627057

ABSTRACT:
The present invention, takes advantage of the properties of quadrature signals to achieve precise quadrature alignment in a simple fashion. The expectation of the product of quadrature signals is zero. A phase error detection network therefore operates by multiplying the received quadrature signals and low-pass filtering the product to produce an error signal. When the signals are in precise quadrature relationship, the error signal will be zero. Real-time feedback control may be used to drive the error to zero. In accordance with another aspect of the invention, a variable phase shift network is achieved using a dual delay line. The difference in delay between the two delay lines is adjusted in response to the error signal to obtain precise quadrature alignment. The principles of the invention may be applied in connection with traditional mixer architectures or with switch-mode architectures.

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