Improving ADC figure-of-merit in wideband antenna array receivers using multidimensional space-time delta-sigma multiport circuits
Improving ADC figure-of-merit in wideband antenna array receivers using multidimensional space-time delta-sigma multiport circuits
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DOI：
10.1109/nds.2017.8070633
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
A. Madanayake;Najath Akram;S. Mandal;Jifu Liang;L. Belostotski
中科院分区：
文献类型：
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作者：
A. Madanayake;Najath Akram;S. Mandal;Jifu Liang;L. Belostotski
本文介绍了最近的工作主题的多维（MD）的时空噪声和失真整形的射频（RF）天线阵列的应用在无线通信，相控阵雷达传感，微波/毫米波成像，射电天文仪器。传播的平面波，从电磁波的MD频谱特性相结合的MD电路和信号处理理论的基础上无源连续终止的2-D滤波器。其结果是，在文献中第一次，是MD多端口扩展的模拟和数字电子设备中发现的无线收发器，包括RF放大器，混频器和数据转换器。特别地，提出了常规模数转换器（ADC）的多端口扩展，其中从非线性操作（诸如量化）生成的失真在多个时空维度上被频谱整形，使得对应于期望平面波的期望RF信号的支持区域（ROS）理想地与这些不期望分量的支持区域互斥。由于频谱整形，失真和噪声都与感兴趣的信号不重叠，并且可以在采样后通过使用MD数字滤波器滤除。在空间和时间域上的MD噪声和失真整形的理论进步确保了由粗略的低复杂度量化引起的电子噪声和非线性失真不会明显降低天线阵列接收器的信噪比和失真比（SNDR）。该方法是传统单输入单输出ADC中常用的Δ − ADC调制的扩展，但不需要时间或空间过采样。此外，据我们所知，本文是第一个联合收割机2-D模拟滤波器来自连续终止的经典无源低通滤波器原型与有源模拟反馈控制在多个维度（空间，时间），以实现2-D模拟-数字混合信号的RF阵列处理应用的电子学。
This paper describes recent work on the topic of multi-dimensional (MD) spatio-temporal noise and distortion shaping for radio-frequency (RF) antenna arrays with applications in wireless communications, phased-array radar sensing, microwave/mm-wave imaging, and radio astronomy instrumentation. The MD spectral properties of propagating plane-waves that arise from electromagnetics are combined with MD circuits and signal processing theory based on passive resistively-terminated 2-D filters. The result, for the first time in the literature, is MD multi-port extensions of the analog and digital electronics found within wireless transceivers, including RF amplifiers, mixers, and data converters. In particular, a multi-port extension of conventional analog-to-digital converters (ADCs) is proposed in which the distortion that is generated from non-linear operations (such as quantization) is spectrally shaped in multiple spatiotemporal dimensions such that the region of support (ROS) of the desired RF signals corresponding to desired planar waves is ideally mutually exclusive with that of these undesired components. Because of spectral shaping, both distortion and noise are non-overlapping with the signal of interest, and can be filtered out after sampling by using a MD digital filter. This theoretical advance in MD noise and distortion shaping across both space and time domains ensures that both electronic noise and non-linear distortion arising from coarse low-complexity quantization do not appreciably reduce the signal to noise and distortion ratio (SNDR) of antenna array receivers. The proposed method is an extension of Δ − Σ modulation that is commonly used in conventional single-input single-output ADCs, but does not require either temporal or spatial over-sampling. Moreover, to the best of our knowledge this paper is the first to combine 2-D analog filters derived from resistively-terminated classical passive low-pass filter prototypes with active analog feedback control in multiple dimensions (space, time) to realize 2-D analog-digital mixed-signal electronics for RF array processing applications.