Digital down-converter

Details Digital down-converter Digital down-converter

2006-10-24

2006-10-24

Ramakrishnaiah, Melur (Department: 2614)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S314000, C455S315000

Reexamination Certificate

active

07127227

ABSTRACT:
A digital down-converter having a low spurious level and a high frequency precision without increasing power consumption of a local oscillator. A first mixer receives, as a first IF input signal, a digital signal obtained by sampling a received signal with an RF signal or an IF signal, and converts the first IF input signal to a second IF signal using the first local oscillator. A digital filter suppresses an outband signal of the second IF signal provided from the first mixer. A second mixer converts an output of the digital filter to a detection process frequency using the second local oscillator. An available frequency step of the first local oscillator is larger than an available frequency step of the second local oscillator.

REFERENCES:
patent: 5375146 (1994-12-01), Chalmers
patent: 5878089 (1999-03-01), Dapper et al.
patent: 6308048 (2001-10-01), Gore et al.
patent: 6549544 (2003-04-01), Kroeger et al.
patent: 6697603 (2004-02-01), Lovinggood et al.

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