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首页> 外文期刊>Circuits and Systems I: Regular Papers, IEEE Transactions on >A Reconfigurable Direct RF Receiver With Jitter Analysis and Applications
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A Reconfigurable Direct RF Receiver With Jitter Analysis and Applications

机译：具有抖动分析的可重构直接射频接收机及其应用

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摘要

In typical direct radio frequency (RF) sampling receivers, the sample clock jitter results in SNR degradation on received signals that increases log linearly with RF signal frequency. De-jittering received signals is computationally expensive, especially for wideband communications signals, because the induced jitter on received signals varies as a function of RF signal frequency. This paper considers a reconfigurable direct RF receiver (RDRFR) that has a stair-step jitter pattern as a function of RF signal frequency. The RDRFR uses a two-stage sampling circuit. In the first stage, the RF input is bandpass filtered and pulse sampled without quantizing the signal. The discrete-time analog signal is then interpolated with a continuous time low-pass filter, then sampled and quantized by a traditional analog-to-digital converter. With this two-stage sampling circuit, the induced signal jitter from the RF sampling is identical for all in-band signals and is the same to within an integer scale factor for all signals, in-band or out-of-band. This key circuit property means that it is possible to remove jitter with very low computational complexity in the RDRFR. Furthermore, this result can be exploited to improve system performance with non-ideal anti-alias filters by identifying non-desired signals caused by out-of-band leakage.
机译：在典型的直接射频（RF）采样接收器中，采样时钟抖动会导致接收信号的SNR下降，并随RF信号频率线性增加对数。消除接收信号的抖动在计算上非常昂贵，尤其是对于宽带通信信号而言，因为在接收信号上引起的抖动随RF信号频率的变化而变化。本文考虑了一种可重构的直接RF接收器（RDRFR），它具有阶梯状抖动模式，它是RF信号频率的函数。 RDRFR使用两级采样电路。在第一阶段，不对信号进行量化就对射频输入进行了带通滤波和脉冲采样。离散时间模拟信号然后通过连续时间低通滤波器进行内插，然后通过传统的模数转换器进行采样和量化。利用这种两级采样电路，来自RF采样的感应信号抖动对于所有带内信号都是相同的，并且对于带内或带外所有信号而言，在整数比例因子内是相同的。该关键电路特性意味着可以消除RDRFR中具有非常低的计算复杂度的抖动。此外，可以通过识别由带外泄漏引起的非期望信号来利用该结果来提高非理想抗混叠滤波器的系统性能。

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