4-Channel Continuous-Time 77 GSa/s ADC using Photonic Bandwidth Compression
4-Channel Continuous-Time 77 GSa/s ADC using Photonic Bandwidth Compression
复制标题
使用光子带宽压缩的 4 通道连续时间 77 GSa/s ADC
DOI：
10.1109/mwp.2007.4378134
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Bahram Jalali
中科院分区：
文献类型：
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作者：
Jason Chou;G. Sefler;J. Conway;George C. Valley;Jason Chou;Bahram Jalali
报告了光子带宽压缩技术的四通道连续时间实现。我们的方法基于瞬态时间拉伸模数转换器 (ADC) 技术，连续高速射频信号在时域中分段并多路复用到并行通道阵列中。在数字化之前，每个通道中的片段在时间上被拉伸，或者等效地在带宽上被压缩。我们技术的优势包括倍增 ADC 的有效采样率和输入带宽。所有 4 通道的各个段使用带外实时校准音连接起来形成连续信号，以独立校正增益和定时误差。本文展示了一种 4 通道连续时间架构，该架构将最先进的实时 50 GSa/s 数字化仪的带宽和采样率提高了 55%。 4 通道系统特别受关注，因为它与商用示波器上可用的输入通道数量相匹配。结果表明了一条通往 4 通道连续时间系统的可行路径，该系统能够将现有数字化仪增强 300% 以上，并在 50 GHz 上实时实现 150 GSa/s。
A four-channel continuous-time implementation of photonic bandwidth compression technique is reported. In our approach, which is based on the transient time-stretched analog-to-digital converter (ADC) technology, continuous high speed RF signals arc segmented in the time domain and multiplexed into an array of parallel channels. The segments in each channel are temporally stretched, or equivalently compressed in bandwidth, before digitization. Benefits of our technique include multiplying the effective sample rate and input bandwidth of an ADC. Segments from all 4-channels arc concatenated to form the continuous signal using an out-of-band real-time calibration tone to independently correct for gain and timing errors. In this paper, a 4-channel continuous-time architecture is demonstrated that increases the bandwidth and sampling rate of a state-of-the-art real-time 50 GSa/s digitizer by 55%. A 4-channel system is of particular interest because it matches the number of input channels available on commercial oscilloscopes. The results indicate a viable path to a 4-channel continuous-time system that would be capable of enhancing existing digitizers by more than 300% and achieving 150 GSa/s over 50 GHz in real-time.