The SST fully-synchronous multi-GHz analog waveform recorder with Nyquist-rate bandwidth and flexible trigger capabilities

S. Kleinfelder, Edwin Chiem, T. Prakash
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引用次数: 15

Abstract

The design and performance of a fully-synchronous multi-GHz analog transient waveform recorder I.C. (“SST”) with fast and flexible trigger capabilities is presented. The SST's objective is to provide multi-GHz sample rates with intrinsically-stable timing, Nyquist-rate sampling and high trigger bandwidth, wide dynamic range and simple operation. Containing 4 channels of 256 samples per channel, the SST is fabricated in an inexpensive 0.25 micrometer CMOS process and uses a high-performance package that is 8 mm on a side. It has a 1.9V input range on a 2.5V supply, exceeds 12 bits of dynamic range, and uses ~128 mW while operating at 2 G-samples/s and full trigger rates. With a standard 50 Ohm input source, the SST exceeds ~1.5 GHz -3 dB bandwidth. The SST's internal sample clocks are generated synchronously via a shift register driven by an external LVDS oscillator running at half the sample rate (e.g., a 1 GHz oscillator yields 2 G-samples/s). Because of its purely-digital synchronous nature, the SST has ps-level timing uniformity that is independent of sample frequencies spanning over 6 orders of magnitude: from under 2 kHz to over 2 GHz. Only three active control lines are necessary for operation: Reset, Start/Stop and Read-Clock. When operating as common-stop device, the time of the stop, modulo 256 relative to the start, is read out along with the sampled signal values. Each of the four channels integrates dual-threshold trigger circuitry with windowed coincidence features. Channels can discriminate signals with ~1mV RMS resolution at >600 MHz bandwidth. Comparator thresholds can be set individually, and their outputs are directly available for simple threshold monitoring and rate control. Alternatively, their High and Low results can be AND'd over an adjustable window of time in order to exclusively trigger on bipolar impulsive signals. Trigger outputs can be CMOS or low-voltage differential signals, e.g. positive-ECL (0-0.8V) for low-noise operation.
SST全同步多ghz模拟波形记录仪,具有奈奎斯特速率带宽和灵活的触发功能
介绍了一种具有快速灵活触发能力的全同步多ghz模拟瞬态波形记录仪(SST)的设计和性能。SST的目标是提供多ghz采样率、固有稳定时序、奈奎斯特采样率和高触发带宽、宽动态范围和简单操作。SST包含4个通道,每个通道256个样品,采用廉价的0.25微米CMOS工艺制造,并使用单侧8毫米的高性能封装。它在2.5V电源上具有1.9V输入范围,超过12位动态范围,在2g采样/s和全触发率下工作时使用~128 mW。使用标准50欧姆输入源时,SST超过~1.5 GHz - 3db带宽。SST的内部采样时钟通过由外部LVDS振荡器驱动的移位寄存器同步产生,该振荡器以一半的采样率运行(例如,1 GHz振荡器产生2g采样/s)。由于其纯数字同步特性,SST具有ps级定时均匀性,与6个数量级以上的采样频率无关:从低于2khz到超过2ghz。操作只需要三条活动控制线:复位,启动/停止和读取时钟。当作为共停止装置工作时,停止时间相对于启动取256模,与采样信号值一起读出。四个通道中的每一个都集成了具有加窗巧合特征的双阈值触发电路。通道可以在bbb600mhz带宽下分辨出RMS分辨率为1mV的信号。比较器阈值可以单独设置,其输出可直接用于简单的阈值监控和速率控制。或者,他们的高和低的结果可以在一个可调的时间窗口,以专门触发双极脉冲信号。触发器输出可以是CMOS或低压差分信号,例如正ecl (0-0.8V),用于低噪声操作。
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