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All-digital frequency synthesis with non-linear differential term for handling frequency perturbations
All-digital frequency synthesis with non-linear differential term for handling frequency perturbations
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机译:具有非线性微分项的全数字频率合成,用于处理频率扰动
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摘要
An all-digital frequency synthesizer architecture is built around a digitally controlled oscillator (DCO) that is tuned in response to a digital tuning word (OTW). In exemplary embodiments: (1) a gain characteristic (KDCO) of the digitally controlled oscillator can be determined by observing a digital control word before and after a known change (fmax) in the oscillating frequency; (2) a portion (TUNE_TF) of the tuning word can be dithered (1202), and the resultant dithered portion (dkTF) can then be applied to a control input of switchable devices within the digitally controlled oscillator; and (3) a non-linear differential term (187, 331) can be used to expedite correction of the digitally controlled oscillator when large phase error changes (335) occur.
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机译:全数字频率合成器架构围绕响应数字调谐字(OTW)进行调谐的数控振荡器(DCO)构建。在示例性实施例中:(1)可以通过观察已知变化(f max Sub>之前和之后的数字控制字来确定数控振荡器的增益特性(K DCO Sub>)。 >)的振荡频率; (2)可以对调谐字的一部分(TUNE_TF)进行抖动( 1202 B>),并将得到的抖动部分(d k Sub> TF Sup>)然后可以应用于数控振荡器内可切换设备的控制输入; (3)当出现大的相位误差变化( 335 B>)时,可以使用非线性微分项( 187,331 B>)来加快数字振荡器的校正速度。
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