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All-digital frequency synthesis with DCO gain calculation
All-digital frequency synthesis with DCO gain calculation
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机译:具有DCO增益计算的全数字频率合成
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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 (Δfmax) in the oscillating frequency; and (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.
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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)可以通过在已知变化(Δf max Sub)之前和之后观察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>),然后将得到的抖动部分(d k Sub> TF Sup>然后可以将)应用于数控振荡器内的可切换设备的控制输入。
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