Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Reexamination Certificate
2007-01-23
2007-01-23
Orgad, Edan (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
C455S182300, C455S139000, C455S179100, C375S135000, C375S136000, C375S146000, C375S147000
Reexamination Certificate
active
10412871
ABSTRACT:
Multi-tuner receiver architectures and associated methods are disclosed that provide initial analog coarse tuning of desired channels within a received signal spectrum, such as transponder channels within a set-top box signal spectrum for satellite communications. These multi-tuner satellite receiver architectures provide significant advantages over prior direct down-conversion (DDC) architectures and low intermediate-frequency (IF) architectures, particularly where two tuners are desired on the same integrated circuit. Rather than using a low-IF frequency or directly converting the desired channel frequency to DC, initial coarse tuning provided by analog coarse tuning circuitry allows for a conversion to a frequency range around DC. This coarse tuning circuitry can be implemented, for example, using a large-step local oscillator (LO) that provides a coarse tune analog mixing signal. Once mixed down, the desired channel may then be fine-tuned through digital processing, such as through the use of a wide-band analog-to-digital converter (ADC) or a narrow-band tunable bandpass ADC.
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Khoini-Poorfard Ramin
Krone Andrew W.
Chan Richard
O'Keefe Egan & Peterman, LLP
Orgad Edan
Silicon Laboratories Inc.
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