发明名称 |
RECEIVER ARCHITECTURES UTILIZING COARSE ANALOG TUNING AND ASSOCIATED METHODS |
摘要 |
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. |
申请公布号 |
WO2004093327(A2) |
申请公布日期 |
2004.10.28 |
申请号 |
WO2004US10765 |
申请日期 |
2004.04.07 |
申请人 |
SILICON LABORATORIES INC.;KHOINI-POORFARD, RAMIN;KRONE, ANDREW W. |
发明人 |
KHOINI-POORFARD, RAMIN;KRONE, ANDREW W. |
分类号 |
H03D3/00;H03L7/18;H04N5/44;H04N5/50;H04N7/20 |
主分类号 |
H03D3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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