High-Performance Front-End Electronics,
Trigger, and Time Base
Mezzanine front end
The channel inputs of the digitizer have programmable
front-end electronics with a complete set of input voltage
ranges (from 50 mV to 5 V full scale into 50 Ω, and to 50 V
full scale into 1 MΩ, in a 1, 2, 5 sequence) and variable volt-
age offset. The front-ends are fully protected against over-
voltage signals. The amplifi ers feature internal calibration
and very fast recovery from out-of-range signals. The input
buffer and amplifi er are mounted on a removable mezzanine
card so that replacement is fast and effi cient in the event of
accidental damage or as components fatigue over time (e.g.
relays in high duty cycle automated testing applications).
Multipurpose I/O Ports
Control over the trigger and time base is made even more
fl exible by the provision of high-frequency I/O ports. The
four MMCX-type front-panel connectors enable the use
of an external clock (up to 2 GHz), or reference signal
(10 MHz), and provide a trigger output and two additional
I/O digital control lines, for monitoring or modifying the
digitizer’s status and confi guration.
Precision Time Base
The digitizer has its own crystal-controlled precision time
base. Sample rates can be selected in a 1, 2, 2.5, 4, 5
sequence, from 100 S/s to 2 GS/s. An internal time-to-
digital converter (TDC) with high timing resolution allows
accurate positioning of the trigger signal with respect to
the internal clock (sampling time). The sample rate can also
be generated externally, using the dedicated MMCX CLK IN
connector.
Flexible Trigger
The digitizer includes a precision trigger system with full
pre- and post-trigger adjustment. User-selectable coupling
is combined with internal or external trigger sources for
maximum fl exibility. The digitizers also provide a sophis-
ticated sequential trigger mode with extremely low dead
time, enabling events, which may occur at very high repeti-
tion rates, to be captured and stored. This greatly extends
the digitizer’s timing range and resolution. Each event can
be individually time-stamped and relative time measure-
ments, between events, made with <1 ns resolution.
Quality Acquisitions
Agilent Acqiris digitizers are designed to provide superior
measurement precision and accuracy. Key acquisition
specifi cations (such as DC accuracy, channel timing skew,
integral and differential linearity) are optimized to deliver
maximum measurement fi delity. Careful circuit layout,
custom ICs, and special packaging techniques are all used
to reduce overall system noise.
Low Parts Count
A high degree of integration is needed in order to achieve
the level of performance obtained with the U1061A digitizer.
By drastically reducing the number of components, the
integration has clear benefi ts in terms of reliability and
lower total power consumption. To maintain quality mea-
surements, the digitizer uses a patented cooling scheme.
This cooling method allows components to run at safe and
stable operating temperatures. It helps to extend compo-
nent life as well as minimize measurement errors caused by
temperature variations.
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