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    • 3. 发明授权
    • Wireless communication system and method using clock swapping during image rejection calibration
    • 无线通信系统和方法在镜像抑制校准期间使用时钟交换
    • US07583946B2
    • 2009-09-01
    • US11340941
    • 2006-01-27
    • Donald A. KerthSrihari AdireddyBrian Douglas GreenTod PaulusScott D. Willingham
    • Donald A. KerthSrihari AdireddyBrian Douglas GreenTod PaulusScott D. Willingham
    • H04B1/06
    • H04B1/28H04B17/21
    • A wireless communication receiver is disclosed that operates in a test mode to determine image correction information that is used to suppress undesired image signals when the receiver switches to a normal operational mode. In one embodiment, the receiver includes a frequency synthesizer coupled by a quadrature divider to an in-phase (I) mixer and a quadrature mixer. The mixers are coupled by respective analog to digital converters (ADCs) to respective I and Q channel inputs of a digital signal processor (DSP). In the test mode, a test tone is provided to the mixer inputs. The test tone is divided down further and provided to clock the frequency synthesizer, the ADCs and the DSP. This configuration locks together the mixers, frequency synthesizer, ADCs and DSP ratiometrically in frequency during the test mode while image correction information is being determined. When the receiver switches to a normal operating mode, the frequency synthesizer, ADCs and DSP are clocked by a main clock signal instead of the divided down test tone, and the test tone is removed from the mixers.
    • 公开了一种在测试模式下操作以确定当接收机切换到正常操作模式时用于抑制不期望的图像信号的图像校正信息的无线通信接收机。 在一个实施例中,接收机包括由正交分频器耦合到同相(I)混频器和正交混频器的频率合成器。 混频器由相应的模数转换器(ADC)耦合到数字信号处理器(DSP)的相应的I和Q通道输入端。 在测试模式下,向混音器输入提供测试音。 测试音被进一步分频并提供给时钟频率合成器,ADC和DSP。 该配置在确定图像校正信息期间在测试模式期间将混频器,频率合成器,ADC和DSP按比例的频率锁定在频率上。 当接收机切换到正常工作模式时,频率合成器,ADC和DSP由主时钟信号而不是分频测试音来计时,测试音从混频器中移除。