Radio having a fast adapting direct conversion receiver

Details Radio having a fast adapting direct conversion receiver Radio having a fast adapting direct conversion receiver

1997-06-13

1999-12-21

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455312, 455324, H04B 110

Patent

active

060060794

ABSTRACT:
A direct conversion receiver (200) is capable of recovering a filtered baseband signal (295) from a radio signal (201) modulated with a baseband signal (202). The direct conversion receiver (200) comprises a radio frequency mixer (205) for converting the radio signal (201) to the baseband signal (202), a lowpass amplifier (210) DC coupled to the radio frequency mixer (205), that amplifies the baseband signal (202) and substantially attenuates components of the baseband signal above a high corner frequency, and a DC offset compensation section (225) DC coupled to the lowpass amplifier (210), that provides a DC offset compensation and a controlled highpass filtering of the baseband signal. A low corner frequency of the DC offset compensation section is smoothly varied from a predetermined maximum value to a predetermined minimum value during a low frequency, low energy portion of the signaling protocol.

REFERENCES:
patent: 5422889 (1995-06-01), Sevenhans et al.
patent: 5448774 (1995-09-01), Yokazaki et al.
patent: 5507036 (1996-04-01), Vagher
patent: 5548068 (1996-12-01), Mohindra
patent: 5557642 (1996-09-01), Williams
patent: 5568520 (1996-10-01), Lindquist et al.

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