Preweighted Linearized VCO Analog-to-Digital Converter
Preweighted Linearized VCO Analog-to-Digital Converter
复制标题
预加权线性化 VCO 模数转换器
DOI：
10.1109/tvlsi.2017.2661754
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发表时间：
2017
影响因子：
2.8
通讯作者：
K. El
中科院分区：
文献类型：
--
作者：
K. M. Al;K. El
提出了一种压控振荡器(VCO)模数转换器(ADC)电压-频率特性的线性化技术。与前人的工作不同，该方法是一种开环结构，无需校准，因此可以在更高的频率下工作。它还独立于延迟元件结构，因此可以应用于各种压控振荡器模数转换器的拓扑结构。模拟输入信号首先通过预加权电阻网络映射，其中每个延迟元件经历不同版本的输入并产生相应的延迟。因此，所提出的方法通过在整个轨至轨输入上扩展传输曲线的线性区域来抑制$V/F$非线性对ADC性能的影响。该技术在全输入范围内将非线性保持在±0.5%以内，取得了显著的改善效果，在−8和0 dBFS输入时，峰值信噪比和失真比分别达到了75.7d B和60.4d B。
A linearization technique of voltage-to-frequency characteristics of voltage-controlled oscillator (VCO) analog-to-digital converters (ADCs) is presented. In contrast to previous works, the proposed technique is an open-loop calibration-free configuration, so it can operate at higher frequencies. It is also independent of the delay element structure, so it can be applied to various VCO ADC topologies. The analog input signal is first mapped through a preweighted resistor network in which every delay element experiences a different version of the input and produces the corresponding delay. As a result, the proposed approach suppresses the impact of $V/F$ nonlinearity on the ADC performance by expanding a linear region of the transfer curve over the full rail-to-rail input. This technique shows substantial improvement results by keeping nonlinearity within ±0.5% over the full input scale (dBFS) and achieves a peak signal-to-noise and distortion ratio (SNDR) of 75.7 and 60.4 dB for input of −8 and 0 dBFS, respectively.