Direct-conversion receiver system and method, especially a...

Details Direct-conversion receiver system and method, especially a... Direct-conversion receiver system and method, especially a...

2007-06-26

2007-06-26

Kuntz, Curtis (Department: 2614)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

Reexamination Certificate

active

10023559

ABSTRACT:
The invention relates to a direct conversion receiver and a method in a direct conversion receiver for processing received radio signals that are modulated and centered at a carrier frequency, the modulation extending a sideband above and below the carrier frequency. The method comprises the steps of mixing a local oscillator frequency signal with said received radio signals for generating baseband frequency signals; filtering out generated disturbing direct current (DC) components of said baseband signals centered at the zero frequency; setting said local oscillator frequency signal equal to or about the carrier frequency plus an offset frequency, said offset frequency being equal to the difference between the carrier frequency and a null frequency, said null frequency centered at a notch of said sideband; and centering said notch at the zero frequency of said baseband signals through mixing. The invention relates particularly to suppression of DC offsets generated in the receivers.

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patent: 5850598 (1998-12-01), Behrent
patent: 5901344 (1999-05-01), Opas
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patent: 6510313 (2003-01-01), Rapeli
patent: 2347284 (2000-08-01), None
patent: WO 99/57912 (1999-11-01), None

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