发明名称 |
Digital DC-offset correction circuit for an RF receiver |
摘要 |
An RF receiver comprising a radio-frequency (RF) down-converter for receiving and down-converting an input RF signal to a lower frequency analog signal (e.g., an IF signal or baseband signal) and analog processing circuitry for receiving the lower frequency analog signal from the RF down-converter and outputting a processed analog signal. The processed analog signal includes a DC-offset signal introduced by the RF down-converter and the analog processing circuitry. The RF receiver also comprises an ADC circuit for converting the processed analog signal to a sequence of digital samples and a DC-offset correction circuit for detecting the DC-offset signal in a digital output signal of the RF receiver. The DC-offset correction circuit adds a DC-offset correction signal to the lower frequency analog signal. Adding the DC-offset correction signal to the lower frequency analog signal reduces the DC-offset signal in the processed analog signal at the analog processing circuitry output.
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申请公布号 |
US7221918(B1) |
申请公布日期 |
2007.05.22 |
申请号 |
US20030638959 |
申请日期 |
2003.08.11 |
申请人 |
NATIONAL SEMICONDUCTOR CORPORATION |
发明人 |
GRASBECK ARI JUHANI;SPORRON MIKAEL |
分类号 |
H04B7/00;H04B1/06;H04B1/16 |
主分类号 |
H04B7/00 |
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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