Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2006-07-04
2006-07-04
Vo, Nguyen T. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S315000
Reexamination Certificate
active
07072633
ABSTRACT:
A double-conversion tuner receives an RF signal having a number of channels and down-converts a selected channel from the plurality of channels. The double-conversion tuner includes a first mixer configured to up-convert the RF signal to a first IF signal using a first local oscillator signal. A first local oscillator includes a delta-sigma fractional-N phase lock loop to produce the first local oscillator signal. The delta-sigma fractional-N phase lock loop is configured to perform fine-tuning of the first local oscillator signal and to have a wide tuning range sufficient to cover the number of channels. A bandpass filter is configured to select a subset of channels from said first IF signal. A second mixer is configured to down-convert the subset of channels to a second IF signal using a second local oscillator signal. A second local oscillator generates the second local oscillator signal. The second local oscillator is configured to perform coarse frequency tuning of the second local oscillator signal and has a narrow tuning range relative to said first local oscillator. The delta-sigma fractional-N phase lock loop in the first local oscillator permits implementation of a double-conversion tuner with improved phase noise for a given amount of power and complexity.
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Gomez Ramon A
Wakayama Myles H
Broadcom Corporation
Sterne Kessler Goldstein & Fox P.L.L.C.
Vo Nguyen T.
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