U1084A Datasheet, PDF (9/20 Pages) Keysight Technologies – Acqiris High-Speed PCIe Digitizers with On-Board Signal Processing

Sequence acquisition
Digitizers acquire waveforms in association with triggers.
Each waveform is made of a series of measured voltage
values (sample points) that are acquired by the ADC at a
uniform clock rate. To maximize sampling rates and utilize
memory as efficiently as possible, the U1084A digitizer firm-
wares include both single and sequential storage modes.
Minimum bank switching dead time for
remarkable sustained rates
The sustained sequential recording (SSR) mode of the
U1084A-DGS digitizer maximizes the available data through-
put allowing data acquisition to run in parallel to the data
readout through the PCIe interface.
The single acquisition mode is the normal operation of
Simultaneous acquisition and readout (SAR) uses a sema-
most digitizer products. In this mode an acquisition consists phore-based technique to automatically switch and redirect
of a waveform recorded with a single trigger.
the digitized data to the second bank once the first has
The sequence acquisition mode allows the capture and
storage of consecutive “single” waveforms in up to
64 thousand segments within the memory. Sequence
acquisition mode is useful as it can optimize the digitizer’s
sampling rate and memory requirements for applications
where only portions of the signal being analyzed are impor-
tant. This mode is extremely useful in almost all impulse-
response type applications.
been filled. Rapid switching combined with state-of-the-art
trigger circuitry dramatically reduces dead time between
successive acquisitions, and allows automatic sequential
waveform recording at remarkably high sustained trigger
rates. This data handling mode is ideal for situations where
fast sequential or burst-style repetitive signals (or pulses)
are being acquired and recorded. Applications include
signal intelligence, synthetic aperture radar, ultrasound,
radar, and lidar.
Sequence acquisition with segments acquires only the
specified data, and so enables successive events, which
can occur within a very short time, to be captured and
stored without loss.
600000
500000
400000
300000
200000
100000
0
400
Maximized trigger rate
4000
Segment Length (Samples)
SAR mode
SAR 4 GS/s
SAR 2 GS/s
SAR 1 GS/s
SAR 500 MS/s
SAR 250 MS/s
SAR 125 MS/s
Standard mode
Std 4 GS/s
Std 2 GS/s
Std 1 GS/s
Std 500 MS/s
Std 250 MS/s
Std 125 MS/s
Figure 2. With SAR function the trigger rate is maximized, the figure shows the maximum trigger rate as a function of segment size for a
large number of segments¹.
1. The maximum trigger rate can be affected by operating system interrupts, PCIe bus activity and other system hardware components.
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