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Tuesday, 07 April 2015 06:58

22 bits testing

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Full End-to-end Analog/Digital/Analog Testing up to 22 Bits:

 

 

ATX7006

 

ANALOG SOURCES

DIGITAL SOURCE/CAPTURE

ANALOG CAPTURE

 

AWG22

22 Bit
2 MHz Max Sample rate
THD: -121 dB @ 1kHz

 

DIGITAL I/O

Multimode Digital Source/Capture
200 MHz data rate
20 bit parallel/24 bit serial capture
Internal Clock Generation up to 1GHz

 

WFD22

22 Bit
1 MHz Max Sample rate
THD: -120 dB @ 1kHz
AWG18
18 Bit
300 MHz Max Sample rate
600 Msps & 1.2Gsps interpolation
THD: -105 dBc @ 10 MHz
  WFD20
20 Bit
2 MHz Max Sample rate
THD: -119 @ 1 kHz
AWG16
16 Bit
400 MHz Max Sample rate
THD: -95 dB @ 1 MHz
  WFD16
16 bit
180 MHz Max Sample rate
THD: -92 @ 1 MHz

 

 

Complete Support Resources Included:

 

DUAL CHANNEL POWER SUPPLY

DUAL REFERENCE SOURCE

 

DPS16

16 Bit
+/- 12V 200 mA w/current limit
2 or 4 wire output
Modulation for PSRR
10 ms settling time

 

DRS20

20 Bit
+/- 10 V +/- 10 mA
1µV/mA load regulation
2ppm Linearity

 

Learn More about ATX7006

With our integrated power supplies and references, you won’t have to wonder whether it’s your power supply, ground loop, fixturing, or some other anomaly.

We sweat the details, so you don’t have to!

Click here to learn more.

 

Monday, 19 October 2015 00:00

Clock Source Jitter Cancelation

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Clock Source Jitter Cancelation

Applicos presented a well received poster covering Clock Source Jitter Cancelation at ITC 2015. The session was well attended, leading to some lively discussions about this simple, but relatively unknown principle.

Poster Session ITC

You can download the poster in pdf format here. The full text giving more background info is below. To download this text as pdf, please click here.

 

Clock Jitter Cancelation in Coherent Data Converter Testing

Kars Schaapman, Applicos

Introduction

The constantly increasing sample rate and resolution of modern data converters makes the test and characterization of such devices very challenging. One of the biggest problems when testing the dynamic performance of the latest generation of data converters is the influence of jitter on the sample clock. The time domain inaccuracy of the sample clock is multiplied into the conversion result as noise and spurious signals and can no longer be distinguished from the performance of the data converter.

Many modern converters have such good performance that clean enough clock sources are seldom available. That being the case, the task therefore turns to removing the resulting undesired effects. This document describes a principal that has the potential to fully cancel source clock jitter in a coherent test set-up. Practical tests showed reductions of 14dB to 55dB of the clock jitter introduced noise, depending on the distance from the carrier.

In this document an ADC will serve as the device under test. It is easy to understand however that the same principle would apply to DACs as well.

Current situation regarding SNR and clock jitter noise

The most basic source of noise in a data converter is quantization. The limited number of steps a signal can be converted causes an error in the digitized signal. This is usually expressed with the following equation:

SNR calculation

where n is the number of bits of the converter

Below is a table showing the theoretical SNR levels of a data converter using the above equation and the SNR of practically available converters:

SNR calculation

The practical SNR values are for the latest generation ADCs with sample rates around 100Msps and low input frequencies. It can be seen that for 8 and 10 bit converters the theoretical SNR is nearly achieved. However beginning from 12 bits the difference increases with each step. For 16-bit converters the difference is approximately -16dB. This tells us that at higher bit counts the importance of non-quantization errors becomes increasingly significant. At higher input frequencies the SNR level increases significantly. A great part of this is due to the inaccuracy of the moment a sample is taken; clock jitter.

How sample clock jitter influences the measurement result

Figure 1 shows how an inaccurate clock edge placement causes an error in the output result of an ADC.

SNR calculation

Figure 1, a variation in the sample moment of dt causes a level error dV

Any deviation in the clock edge position is transformed into an amplitude deviation. The error is not only dependent on dt but also on the slew rate of the sampled signal at the sample moment. This means that at higher signal frequencies the effect of jitter of the clock edge is increasing proportionally.

The SNR introduced by clock jitter on a sampled sine wave signal can be expressed as:

SNR vs clock jtter

When the noise level caused by jitter is known, the jitter can be expressed as:

Noise due to jitter

When performing an FFT on a measured signal we can see both the random noise and deterministic noise showing up in the spectrum. Figure 2 gives an example of how much a measurement result can be influenced by the quality of the sample clock. The jittery clock raises the noise floor with about 6dB and introduces several spurious signals that are not visible when a low jitter clock is used.

ADC FFT High quality clock vs poor quality sample clock

Figure 2, result of an ADC test where the green FFT is with a high quality sample clock and the red FFT with a poor quality sample clock

Principle of jitter cancelation

Since it is very difficult to find clocks with sufficiently low jitter when testing recent high speed data converters it was investigated whether it would be possible to compensate for the error due to jitter by introducing exactly the same jitter in the applied input. The figure below shows the basic principle:

Cancel jitter error by applying same jitter to input

Figure 3, canceling out the jitter error by applying the same jitter to the input signal

When we apply a sinewave to an ADC input, the signal can be expressed as:

Signal formula

When quantizing this signal with an error in the timing the quantized result will be:

Signal quantized

The difference between the input sinewave and the quantized waveform is now:

Difference sinewave and quantized sinewave

When we add the timing error tj to the input signal we get:

Error due to timing error

The difference between the input signal and quantized signal is now zero, so magnitude and frequency of tj are no longer relevant.

Practically: how to add the sample clock jitter to a test signal

In a test setup for coherent measuring of an ADC the test signal is often generated with a DAC (as part of an AWG). This opens up an easy way to "time modulate" (phase shift) the input signal with the same clock jitter as the ADC under test. By clocking the Arbitrary Waveform Generator with the same clock as we use for the ADC under test we modulate the same jitter onto the test signal. Figure 4 illustrates this:

Jitter cancelled when from the same input clock

Figure 4, when the signal source clock and ADC clock are the same the jitter of this clock does not contribute to the test result.

Limitations:

The above given principle only works properly when the AWG clock input is coupled directly, without a PLL or other circuitry that may modify the jitter. The bandwidth of the clock path must be sufficient to propagate the jitter range of interest into the DAC output signal. Also, the bandwidth of the AWGs output stage must accommodate the frequency range of the jitter to be canceled.

Further the measurement should be coherent. For a setup as in figure 5 this is inherent. The practical implementation is the easiest if the clock rate of the DAC (AWG) and the ADC under test are the same because they can then just share the same clock source.

Using two independent clock generators and synchronizing them with a reference clock usually doesn't work, because the PLL circuitries involved synchronize the frequencies but not the jitter. Both generators will have their own "uncorrelated" jitter adding up to the total jitter of the setup. Another limitation is that there should be no, or only a minimal phase shift between the DAC output and the ADC under test input (see figure 5).

This would mean that the propagation delay in the signal path from the DAC to the ADC should be zero. In practical situations there will always be some phase shift. When this delay is small compared to the period of the jitter frequency of interest the degradation will be small. However, when there is a significant phase shift, the cancelation effect will disappear or even become adverse for higher jitter frequencies. Note that the effect of the phase shift is related to the period of the jitter, not the period of the test signal. In practice this means that the effect of a non-matching phase will become worse at higher jitter frequencies.

Jitter cancelation with phase shift

Figure 5, the jitter cancelation will reduce or even become adverse with increasing phase shift.

To prevent the reduction of jitter cancelation due to phase shift it will usually be necessary to delay the clock timing of the ADC clock with the same amount as the delay in the signal path. Figure 6 shows this. The delay(s) must keep the clock jitter intact but should not add jitter by themselves.

Eliminate phase shift for jitter optimization

Figure 6, the clock timing at the ADC needs to be aligned to eliminate any phase shift.

A solution for this may be found in a dedicated clock circuit that divides the clock frequency of the primary clock and can shift the divided clock with whole periods of the primary clock. When the output clock edges are then re-synchronized to the primary clock, the jitter in both clocks will be the same again.

Practical measurements

To verify the above principle lab measurements have been done using the test setup as shown in figure 7.

Lab setup for jitter cancelation measurements

Figure 7, jitter cancelation measurements - lab setup.

This setup is using an AWG for the test signal generation. Both the AWG and the ADC under test were clocked at 250MHz. The AWG was programmed to generate a test frequency of 25.169MHz and its 30MHz output filter was used to reconstruct the waveform. The setup uses two 250MHz clock sources that are synchronized via a 10MHz reference clock. The ADC under test was always connected to clock source 2, which can be phase modulated with a third signal source in order to inject a known jitter. The AWG could be connected to clock source 1, where there is no jitter cancelation, or to clock source 2 where the jitter is expected to be cancelled. The clock path to the ADC under test was delayed with a coaxial cable to compensate for the propagation time from the AWG clock input to the ADC under test input (approx. 25ns in this case).

To make the jitter influence clearly visible in the spectrum, a deterministic jitter was injected into clock source 2. First, the AWG was clocked from clock source 1 and the ADC under test from clock source 2. Clock source 2 was phase modulated with a deterministic jitter and the level of this jitter was adjusted to cause a -60dBFS signal at both sides of the carrier. The AWG was then switched to sample clock 2 and the remaining level of the deterministic signal was measured. The difference of these two is the amount of cancelation for that jitter frequency.

Figure 8 shows the spectrum with a 100kHz deterministic jitter added to clock 2 and the AWG connected to clock 1. Figure 12 shows the same but with the AWG connected to clock 2. As we can see the cancelation effect causes the 100kHz jitter to fully disappear in the noise floor.

Non cancelled jitter at 100kHz

Figure 8, 100kHz jitter non cancelled

Cancelled jitter at 100kHz

Figure 12, 100kHz jitter cancelled

Consecutive measurements at higher jitter frequencies showed that the effect of the cancelation reduces for higher jitter frequencies (see table 2). At 10MHz a reduction of 14dB was measured which is still a significant improvement compared to a non-cancelled situation.

Jitter attenuation for frequencies from 20kHz to 10MHz

Conclusion

Using a data converter test set up that applies the same master clock source to both the test signal generator and the ADC under test can greatly reduce the influence of the jitter of this clock source.

The amount of cancellation is influenced by the bandwidth of the clock and signal paths and by a proper alignment of the signals. In a practical test setup jitter reductions between 14dB and 55dB were measured.

The cancelation principle is limited to frequencies below the bandwidth of the clock- and test signal paths. This means that the quality of the clock source remains important but the improvement that can be achieved is very significant when clock jitter is a critical factor.

References

  • [1] Brad Brannon, Sampled Systems and the Effects of Clock Phase Noise and Jitter, Analog Devices Inc. AN-756, 2004
  • [2] J. Ostermeier, Selecting a Signal Generator for Testing AD Converters, R&S App note, 2010
  • [3] Brannon, Brad.. “Aperture Uncertainty and ADC System Performance.” Analog Devices, Inc. AN-501, 2000
  • [4] R. von de Plassche, “Integrated analog-to-digital and digital-to-analog converters” Kluwer Academic Publisher, Dordrecht, 1994.
Monday, 16 March 2015 08:24

For Data Converter Superheroes Only!

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Superhero

 

For Data Converter Superheroes Only!

 

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ATX7006

 

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Monday, 30 June 2014 06:39

Software

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Software

Applicos has a long history when it comes to Analog and Mixed-signal analysis software and instrument drivers. They are provided with our instruments and modules, but we also use our expertise to create user specific software, with the emphasis on signal processing and analysis.

We have state of the art software development tools and many library routines at our disposal to meet your requirements.

Drivers, User Interfaces and Special Applications can be developed in C++, C#, LabWindows CVI, LabVIEW and other platforms.

 

 

Software-Test-and-Measurement-Analysis

Custom & OEM Products

Applicos can provide custom hardware and software for many applications within the Analog/Mixed Signal area. We offer a unique combination of full-service assistance throughout the entire product realization process, from conceptualization to prototyping and manufacturing.

We have thorough experience of various software and hardware platforms commonly used in the Test & Measurement world. Many years of experience and a large number of available IP cores allow us to create new products within a short time frame.

custom_products

 

For information about our technologies, please download our technology overview document (pdf).

Monday, 02 September 2013 12:29

Applicos - Excellence in mixed signal technology

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Monday, 02 September 2013 11:38

Disclaimer

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Disclaimer

The information contained in this website is for general information purposes only and is subject to change without notice. The information is provided by Applicos and whilst we endeavour to keep the information up-to-date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk. In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from loss of data or profits arising out of, or in connection with, the use of this website.

 

 

 

 

 

 

 

 

 

 

 

 

Monday, 02 September 2013 09:46

Applicos - Contact information

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applicos building

 

  Applicos Headquarters Applicos North America

Address:

 

 

Phone:

e-mail:

Veldkampseweg 1

8181LN Heerde

The Netherlands

+31 578 696769

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605 Main St, #4744

Vancouver, WA 98660

USA

+1 360 558 3005

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All Applicos products

  • Danatec (Korea)

    #402 Yatop Leaders B/D
    342-1 Yatop-dong
    Bundang-Gu, Seongnam-Si, Gyeonggi-Do
    Korea 463-070
    Tel: +82-31-714-9715
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    Website:www.danatec.co.kr
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  • DMT TRADING Ltd (North East Europe)

    Pobeditelei av., 89/2-1, of. 01
    220020, Minsk
    Belarus
    Tel: +375 17 209 63 41
    Fax: +375 17 209 63 42
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    Website: www.dmt.by
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  • F-Brain (Japan)

    3-5-7 Hisamoto, Takatsu-ku
    Kawasaki-shi, Kanagawa-ken
    +81 44 844 9631
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    Website:
    www.fbrain.co.jp
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  • Beijing Miko-Xinye Electronics Technology (China)

    Room D1109,11F,Tower D,U-CENTER,NO.28
    Chengfu Road, Haidian District,Beijing
    China 100083
    Tel: +86 10-82863522
    Fax: +86 10-62660032
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    Website: www.mikoxd.com
    Webshop: www.ecemart.com
    Miko

Applicos PXI sales partners

  • Pickering Interfaces (UK)

    Stephenson Road,
    Clacton On Sea
    Essex, CO15 4NL
    United Kingdom
    Tel: +44 (0)1255 687900
    Fax: +44 (0)1255 425349
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    Website:www.pickeringtest.com
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  • StanTronic Instruments (UK)

    53A High Street
    Bugbrooke
    Northampton NN7 3PG
    United Kingdom
    Tel: +44 (0)1604 832521
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    Website:www.stantronic.co.uk
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  • PXI Direct (Germany)

    Germany
    Tel1:
    +49-5130-58888-0
    Tel2: +49-9342-240 3451
    Website:www.pxidirect.com
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  • Remak (Italy)

    Via Grosio 10/10
    20151 Milano
    Italy
    Tel: +39-02-30302525
    Fax: +39-02-303025901
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    Website:www.remak.it

    Remak
  • T&M Systems (Benelux)

    Centaurusweg 148-b
    5015 TA Tilburg
    The Netherlands
    Tel NL: +31 (0)13 4639540
    Tel BE: +32 (0)9 238 2248
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    Website:www.TMsystems.nl
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  • Acqiris (Japan)

    Aki building 201,
    4-11-5 Fuda
    Chofu-shi, Tokyo 182-0024
    Japan
    Tel: +81-42-490-7741
    Fax: +81-42-487-8371
    Email:
    Website:www.acqiris-jp.com
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  • VigVen Tech Mark Pvt Ltd. (India)

    #26, RBI Colony, 2nd Main Road, Ananda Nagar, Bangalore - 560024
    Tel: +91 80 2333 9220
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  • LXinstruments GmbH (Germany)

    Waldenbucher Str. 42
    D-71065 Sindelfingen
    Deutschland
    Tel: +49(0)7031 / 410089-0
    Fax: +49(0)7031 / 410089-18
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  • Acquisys (France)

    30 av Robert Surcouf
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  • Acquitek (France)

    1 bis rue Marcel Paul
    91300 Massy
    France
    Tel: +33 (0)1 60 13 52 73
    Fax: +33 (0)1 60 13 03 68
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    Website:www.acquitek.fr
    LXinstruments

 

Monday, 02 September 2013 04:57

Applicos - Company - analog/mixed signal products

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Company

Applicos is a Dutch-based company that started in 1993 with an instrument for test & analysis of data converters. This is still an important product for us but in the mean time we have developed many other Analog and Mixed-signal products, leveraging our experience and best-in-class designs into other markets.

Almost all of the Applicos employees are electronic engineers working as Mixed-signal designer for many years. This ensures we can handle challenging design tasks quickly and efficiently.  For volume manufacturing we work with external partners so we can stay focused on design and support of our products.

Company

Commitment to your Satisfaction

At Applicos we believe that customer satisfaction is the true test of our contribution to the mixed-signal marketplace.  We have done our job when our customers are happy. We will use all of the resources at our disposal to meet this goal.

More information

General information about Applicos can be found in our company brochure (pdf).

An overview of the available IP-cores and technologies can be found here: Applicos technology overview (pdf).

 

 

 

Saturday, 31 August 2013 16:49

Custom & OEM

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Custom & OEM Products

Applicos can provide custom hardware and software for many applications within the Analog/Mixed Signal area. We offer a unique combination of full-service assistance throughout the entire product realization process, from conceptualization to prototyping and manufacturing.

We have thorough experience of various software and hardware platforms commonly used in the Test & Measurement world. Many years of experience and a large number of available IP cores allow us to create new products within a short time frame.

custom_products

Software

Applicos has a long history when it comes to Analog and Mixed-signal analysis software and instrument drivers. They are provided with our instruments and modules, but we also use our expertise to create user specific software, with the emphasis on signal processing and analysis.

We have state of the art software development tools and many library routines at our disposal to meet your requirements.

Drivers, User Interfaces and Special Applications can be developed in C++, C#, LabWindows CVI, LabVIEW and other platforms.

 

 

Software-Test-and-Measurement-Analysis

 

For information about our technologies, please download our technology overview document (pdf).