发明名称 |
Receiver including an oscillation circuit for generating an image rejection calibration tone |
摘要 |
A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by respective amounts to derive a desired calibration tone frequency and a desired PLL reference signal frequency. In addition to the oscillator circuit, the receiver circuit may further include a phase locked circuit configured to generate a PLL output signal that is phase locked in relation to the PLL reference signal. During a calibration mode, a quadrature generator may be used to generate quadrature mixer local oscillator signals dependent upon the PLL output signal, and an in-phase/quadrature mixer may be used to mix the calibration tone with the quadrature mixer LO signals.
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申请公布号 |
US2005069056(A1) |
申请公布日期 |
2005.03.31 |
申请号 |
US20030673905 |
申请日期 |
2003.09.29 |
申请人 |
SILICON LABORATORIES, INC. |
发明人 |
WILLINGHAM SCOTT D. |
分类号 |
H04B1/30;(IPC1-7):H03D3/18 |
主分类号 |
H04B1/30 |
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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