Receiver architectures utilizing coarse analog tuning and...

Details Receiver architectures utilizing coarse analog tuning and... Receiver architectures utilizing coarse analog tuning and...

2003-04-14

2008-03-04

Maung, Nay (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

C455S139000, C455S182300, C455S179100, C375S136000, C375S146000, C375S147000

Reexamination Certificate

active

07340230

ABSTRACT:
Receiver architectures and associated methods are disclosed that provide initial analog coarse tuning of desired channels within a received signal spectrum, such as a set-top box signal spectrum for satellite communications. These 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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