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公开(公告)号：EP3300250A1
公开(公告)日：2018-03-28
申请号：EP17190369.3
申请日：2017-09-11
申请人： NXP B.V.
发明人： RUTTEN, Robert , BREEMS, Lucien Johannes , BREKELMANS, Johannes Hubertus Antonius , NIEHOF, Jan , BOLATKALE, Muhammed , BAJORIA, Shagun
CPC分类号： H04L25/03885 , H03D3/009 , H04L27/3863 , H04L2025/0349 , H04L2025/03808
摘要： Corrections are provided for mismatches between an in-phase (I) signal and a quadrature-phase (Q) signal, the I and Q signals having a first frequency band. A frequency filter circuit filters the I and Q signals to produce a filtered I and Q output with a second frequency band that is a subset of the first frequency band. Digital circuitry includes a multiple-tap correction filter having a plurality of taps and configured to generate I and Q output signals by filtering the I and Q signals according to respective sets of coefficients for the plurality of taps. A coefficient estimator generates the sets of coefficients relative to different frequency bands.
摘要翻译： 对同相（I）信号和正交相（Q）信号之间的不匹配提供校正，I和Q信号具有第一频带。 频率滤波器电路对I和Q信号进行滤波以产生具有作为第一频带的子集的第二频带的经滤波的I和Q输出。 数字电路包括具有多个抽头并被配置为通过根据多个抽头的相应系数组对I和Q信号进行滤波来产生I和Q输出信号的多抽头校正滤波器。 系数估计器生成相对于不同频带的系数集合。
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公开(公告)号：EP2340613A1
公开(公告)日：2011-07-06
申请号：EP09744470.7
申请日：2009-10-21
申请人： NXP B.V.
摘要： A sigma-delta modulator (400) 400, 500, 600) for converting an input signal (X(s)) (X(s)) to a quantized output signal (Y(z)) (Y(z)), in which a feedback loop is provided between a filter (402) and a quantizer (403) of the modulator, the feedback loop configured to reduce quantization errors from the modulator by filtering and subtracting quantization noise fed back to an input of the quantizer (403).
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公开(公告)号：EP2319182A2
公开(公告)日：2011-05-11
申请号：EP09786730.3
申请日：2009-07-28
申请人： NXP B.V.
IPC分类号： H03M3/02
摘要： A method is disclosed of compensating the output of an ADC for non- linearity in the response of the ADC. The methodcomprises converting an analog input signal to uncorrected digital ADC output samples, applying a vector of correction variables to each of a block of uncorrected ADC output samples to provide a block of corrected ADC samples, and iteratively minimizing a measure of the spectral flatness of the block of corrected ADC samples with response to the vector of correction variables.
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公开(公告)号：EP3621197A1
公开(公告)日：2020-03-11
申请号：EP19190690.8
申请日：2019-08-08
申请人： NXP B.V.
发明人： MARSCHNER, Juergen Richard , RUTTEN, Robert , GABRIEL, Niels , Van ANSEM, Tjeu , HARMSZE, Francoise Jeannette , BLINZER, Peter , STEENHOF, Frits Anthonie
摘要： Certain aspects of the disclosure are directed to in-phase/quadrature, IQ, mismatch detection and correction in radio frequency receivers. According to a specific example, a method of manufacture or use comprises, in a quadrature radio-frequency receiver configured to process signals using I and Q components, providing parameters indicative of IQ mismatches associated with circuitry of the quadrature radio-frequency receiver due to changes in signal gain. The method further includes, while using the quadrature radio-frequency receiver to receive and process a received radio signal, correcting for the IQ mismatches by using the parameters in response to actual signal gain change.
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