Comparison of Digitally-Enhanced GS/s Analog-to-Digital Converters
In this issue you can read about commercially available GS/s
analog-to-digital converters enhanced by our digital mismatch error
correction IP-core ADX4.
After a decade of research and development and over 120 man years
invested, Signal Processing Devices Sweden AB is today the leading
provider of digital post-processing solutions for high-performance
analog-to-digital converters (ADCs). Please read this newsletter to learn
more about the significant performance level improvements achievable with
All time-interleaved ADCs have unwanted mismatch-induced aliasing that
grows worse with frequency. With digital error correction this distortion
can be suppressed even when the errors vary over frequency. SP Devices
post-processing IP-core ADX4 can equalize the differences
between all the ADCs to such a small level that the unwanted aliasing
spurs are suppressed down to the noise floor.
Our post-processing enhancement significantly shortens time-to-market and
state-of-the art performance levels can efficiently be realized for new
ADX4 demonstrated in this newsletter is a well-proven and
mass-produced enhancement technology that is available for instantiation
in FPGAs as well as ASICs. The figure shows the measured results when
is used to enhance three different GS/s ADCs, the
EV10AQ190 from E2V Technologies Plc, the
ADC12J4000 from Texas Instruments, Inc, and the
AD9625 from Analog Devices, Inc.
Figure: Time-interleaved ADC mismatch spur level
comparison when applying digital mismatch error correction to three
different GS/s analog-to-digital converters. The devices used are E2V
EV10AQ190 (5 GS/s, 10 bits in Blue color), Texas Instruments ADC12J4000 (4
GS/s, 12 bits in Red color), and Analog Devices AD9625 ( 2.5 GS/s, 12 bits
in Yellow color). The achieved mismatch spur level with
ADX4 and the native ADC spur level are plotted with Solid
and Dashed line, respectively.
The performance of all three ADCs is improved significantly by ADX4.
Further, while the AD9625 can be enhanced to the highest performance
level, even the 10-bit EV10AQ190 can surpass the 12-bit alternatives
AD9625 and ADC12J4000 in their native state if enhanced by ADX4.
Please visit www.spdevices.com for more information
regarding our digital post-processing technology and don't hesitate to
to learn how your design could be enhanced!