Design of a feedback digitally controlled oscillator for linearity enhancement
Design of a feedback digitally controlled oscillator for linearity enhancement
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用于增强线性度的反馈数控振荡器的设计
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Janet Roveda
中科院分区：
文献类型：
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作者：
S. Jung;Janet Roveda
本文提出了一种新型反馈式数控振荡器（DCO），以提高高线性度。由于负反馈环路，反馈DCO显示输入数字控制字与输出频率之间的线性关系。此外，反馈DCO分别对输入数字控制字和DCO噪声具有低通和高通滤波效果。因此，我们能够根据每个噪声源来改变和优化反馈DCO的带宽。我们在130 nm CMOS工艺上设计了反馈DCO方案。所提出的反馈DCO的峰峰值增益为17 MHz/LSB，比传统DCO小96%。反馈DCO在2.2 GHz输出频率下的功耗为1.7 mW。
This paper presents a novel feedback digitally controlled oscillator (DCO) to enhance a high linearity. Because of a negative feedback loop, the feedback DCO shows a linear relationship between an input digital control word and an output frequency. In addition, the feedback DCO has a low-pass and high-pass filtering effect on the input digital control word and a DCO noise, respectively. Hence, we are able to change and optimize the bandwidth of the feedback DCO according to the each noise sources. We designed the feedback DCO scheme in 130 nm CMOS technology. The peak-to-peak gain of the proposed feedback DCO is 17 MHz/LSB which is 96% smaller than a conventional DCO. The feedback DCO consumes 1.7 mW at 2.2 GHz output frequency.