Based on synchronized time interleaved (STI)analog to digital conversion system, an alternative method for ultra-wideband signals sampling has been developed and named as the generalized asynchronous time interleaved (G-ATI) sampling structure. When the input signal bandwidth is large enough, such as 50GHz and above, the STI is generally constructed by three parts: (i) the analog preprocessing circuit that is used to divide the input signal into N sub-channels (N > 2); (ii) the analog sampling circuit that is driven by extremely narrow sampling clock pulses and convert wideband analog signals to discrete pulse signals in each sub-channel; (iii) ADC and digital post processing circuit that is driven by time-based clock and capture the peak value of the pulses and converting them to digital signals. Compared with STI, our G-ATI sampling structure introduces a low-pass filter into the middle of the second and third part in each sub-channel, which can turn the discrete analog signals generated in the second part into continuous signals again. This method has two benefits: one is reducing the bandwidth of each sub-channel before ADC; the other is that the time-based clock does not need to be synchronized with the sampling clock. A simulation of the G-ATI based on an optoelectronic joint sampling system with a total sampling rate of 128 GSPS and 16 time-interleaved sub-channels is executed and the simulation results show the feasibility of the structure of G-ATI.

中文翻译：

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超宽带信号的广义异步时间交织（G-ATI）采样结构

基于同步时间交错(STI)模数转换系统，开发了一种用于超宽带信号采样的替代方法，并将其命名为广义异步时间交错(G-ATI)采样结构。当输入信号带宽足够大时，如50GHz及以上，STI一般由三部分构成：(i)模拟预处理电路，用于将输入信号分成N个子通道(N>2)；(ii) 由极窄采样时钟脉冲驱动的模拟采样电路，将宽带模拟信号转换为每个子通道中的离散脉冲信号；(iii) ADC 和数字后处理电路，由基于时间的时钟驱动，捕获脉冲的峰值并将其转换为数字信号。与 STI 相比，我们的 G-ATI 采样结构在每个子通道的第二和第三部分中间引入了一个低通滤波器，可以将第二部分产生的离散模拟信号再次转换为连续信号。这种方法有两个好处：一是降低ADC前各子通道的带宽；另一个是基于时间的时钟不需要与采样时钟同步。对基于总采样率为128 GSPS和16个时间交错子信道的光电联合采样系统的G-ATI进行了仿真，仿真结果表明了G-ATI结构的可行性。这种方法有两个好处：一是降低ADC前各子通道的带宽；另一个是基于时间的时钟不需要与采样时钟同步。对基于总采样率为128 GSPS和16个时间交错子信道的光电联合采样系统的G-ATI进行了仿真，仿真结果表明了G-ATI结构的可行性。这种方法有两个好处：一是降低ADC前各子通道的带宽；另一个是基于时间的时钟不需要与采样时钟同步。对基于总采样率为128 GSPS和16个时间交错子信道的光电联合采样系统的G-ATI进行了仿真，仿真结果表明了G-ATI结构的可行性。