Offset compensation in a direct-conversion receiver

Details Offset compensation in a direct-conversion receiver Offset compensation in a direct-conversion receiver

2005-03-01

2005-03-01

Vuong, Quochien B. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S251100, C455S324000, C455S341000, C375S345000

Reexamination Certificate

active

06862439

ABSTRACT:
A direct conversion receiver comprises a low noise amplifier, a bandpass filter, a mixer circuit and a baseband processing assembly. The low noise amplifier is capable of receiving communication signals from an antenna and, in turn, the bandpass filter is capable of filtering the received signals to a bandpass including a reception frequency band. The mixer circuit is electrically connected to an output of the bandpass filter, and can demodulate the received signals into differential signals in two channels. The baseband processing assembly is electrically connected to the mixer circuit opposite said bandpass filter. In this regard, the baseband processing assembly can process the demodulated differential signals in at least one of the channels. And to compensate DC offset from the demodulated differential signals, for each channel the baseband processing assembly includes a pair of dynamic offset compensation elements and a static offset compensation element.

REFERENCES:
patent: 5422889 (1995-06-01), Sevenhans et al.
patent: 6366622 (2002-04-01), Brown et al.
patent: 6560448 (2003-05-01), Baldwin et al.
patent: 6748200 (2004-06-01), Webster et al.
patent: 6748201 (2004-06-01), Black et al.
patent: 6771720 (2004-08-01), Yang et al.

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