Direct conversion wireless receiver with digital phase...

Details Direct conversion wireless receiver with digital phase... Direct conversion wireless receiver with digital phase...

2005-12-27

2005-12-27

Urban, Edward F. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S307000, C329S318000, C329S320000

Reexamination Certificate

active

06980785

ABSTRACT:
A direct conversion receiver (DCR) with a pair of quadrature conversion paths. Each of the quadrature conversion paths receives an RF input signal and converts the RF input signal to a digital baseband signal. The quadrature conversion paths each include a mixer mixes the RF input signal with a carrier phase signal. Quadrature baseband signals from the mixer pass through an analog filter which provides a filtered baseband signal. An analog to digital converter (ADC) converts the quadrature baseband component to a digital baseband signal. A 5thorder elliptical filter filters the quadrature baseband component. The 5thorder elliptical filter may be before or after the ADC. A digital baseband component from the ADC and filtered by the 5thorder elliptical filter passes to a phase equalizer which compensates for phase distortion from the analog filter. The quadrature digital baseband outputs from the quadrature conversion paths are passed to a baseband processor.

REFERENCES:
patent: 5828955 (1998-10-01), Lipowski et al.
patent: 5896306 (1999-04-01), Aschwanden
patent: 2002/0123319 (2002-09-01), Peterzell
patent: 2003/0214926 (2003-11-01), Choi et al.

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