发明名称 |
System and method for I-Q mismatch compensation in a low IF or zero IF receiver |
摘要 |
A compensation circuit to correct for mismatch in a quadrature receiver comprises first and second mixers to receive a radio frequency (RF) modulated signal. One mixer receives an I local oscillator signal while the second mixer receives a Q local oscillator signal wherein the I and Q local oscillators have frequencies that are substantially identical. The output of the first and second mixers are coupled to first and second filters, respectively, which generate the I and Q output signals, respectively. Inherent circuit mismatch generate gain and/or phase errors that result in mismatch in the I and Q output signals. A correction circuit automatically applies a correction factor to at least one of the I and Q output signals to correct the gain and/or phase error by applying a multiplication factor to at least one of the I and Q output signals to thereby generate a corrected signal. The correction factors must be determined on a unit by unit basis. Testing in the final stages of factory assembly may be used to determine the value of the correction factor. The correction factor may be stored in a memory of the wireless communication device and used thereafter.
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申请公布号 |
US2003139167(A1) |
申请公布日期 |
2003.07.24 |
申请号 |
US20020157259 |
申请日期 |
2002.05.29 |
申请人 |
CICCARELLI STEVEN C.;RAGHUPATHY ARUN;REEVES ROBERT |
发明人 |
CICCARELLI STEVEN C.;RAGHUPATHY ARUN;REEVES ROBERT |
分类号 |
H03D3/00;H04B1/30;H04L27/00;(IPC1-7):H04B1/10;H04B1/26 |
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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