Unique Performance Advantages with ADX
In this issue you can read about the embedded signal processing that
provides the highest spectral purity to SP Devices' digitizers.
SP Devices' ADX Technology Enables Digitizers with Unique Spurious
Performance
Many data acquisition systems benefit from higher sampling rate for a
given vertical resolution (measurement accuracy). Unfortunately
limitations in analog-to-digital converters (ADCs) put restrictions on
which sampling rates that can be achieved - and for ADCs with higher
resolution the limitations are more severe.
Time-interleaved ADCs (TIADCs) is a well-recognized approach to increase
the sampling rate and many of today's high-performance ADC components are
based on this approach. However, the internal structure of these
components introduces analog mismatch errors which degrade performance
unless calibrated or corrected.
The mismatches in TIADCs create a nonlinear distortion effect called
aliasing that often limits the Spurious-Free Dynamic Range (SFDR) and this
may in turn have a negative effect on other performance parameters such as
the effective number of bits (ENOB).
SP Devices can as the only digitizer vendor provide performance enhanced
data acquisition solutions based on the
ADX technology for
TIADCs. The ADX IP-core
operates in the background and removes this aliasing distortion over a
large portion of the frequency band - yielding performance that surpasses
ADC datasheet specifications. The technology is used/promoted by a number
of leading ADC and oscilloscope vendors.
The figure below illustrates how
ADX is used to increase
the performance of the ADC used in SP Devices'
ADQ412-3G
digitizer. The 12-bit ADC is operated at a sampling rate of 3.6 GS/s and
trough the use of
ADX the
time-interleaving spur is attenuated over 90% of the Nyquist band - for
certain frequencies with up to 20 dB!
The time-interleaving spur of SP Devices' ADQ412-3G (green line)
digitizer is significantly better (more negative number is better) than
the performance of the ADC itself (red dashed line). Plot shows typical
values.
Press the button Read More below to download our white paper "Digital
Time-Interleaved ADC Mismatch Error Correction Embedded into
High-Performance Digitizers" which contains more information about the
achieved resolution improvement levels.
Performance Enhanced Digitizer Products
Several of SP Devices' digitizers are delivered with
ADX embedded and thereby
offer enhanced spurious performance compared to other digitizer products
employing time-interleaved analog-to-digital converters.
Besides the obvious advantages offered by
ADX, the digitizers of
course also supports a wide variety of other features such as advanced
trigger capabilities, deep on-board acquisition memory, open FPGA, and a
large set of pre-defined real-time digital signal processing features.
The table below lists our products that are delivered with
ADX, but please also
feel free to click
here
to read more about our complete digitizer product portfolio.
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