Friday, December 3, 2010

Creating a Differential Signal with a Function / Arbitrary Waveform Generator

Single-ended signals are referenced to a common level, such as ground, that they can share with other signals, so a single-ended signal requires only a single path or wire. Differential signals are made up of a pair of paths that are both dedicated to a single signal at any given time. One path is used at a higher potential than the other. Differential signals do add complexity, since they require two wires instead of just one, but they provide a number of performance advantages over single-ended signals.
Differential signal advantages include better signal-to-noise ratio, fewer timing errors, and less crosstalk. These advantages make differential signals common in applications such as ADC inputs, instrumentation amplifiers, measurement sensors (like accelerometers), and communication signals. When engineers design and test devices that use differential signals, simulating the differential signals for testing can be challenging. These challenges are caused by the fact that most function/arbitrary waveform generators (FAWGs) have single-ended outputs; instruments that can generate differential signals tend to be fairly costly. In this post I will explain two ways to create a low cost differential signal: using a FAWG with some custom hardware and using a 2-channel FAWG
One way to use custom hardware at the output of a single-ended source to create a differential signal is to use a differential amplifier circuit design as shown it the figure.

The resistors in the differential circuit were chosen to achieve a gain value of 1. I set the DC offset to 0 V. When building the circuit, be careful to keep signal paths and wiring as short as possible to keep parasitic reactive affects low for better signal integrity.
FAWG’s with two single-ended channels (isolated from ground) can have their channels combined into a single differential signal channel. To do this, you need to tie together the two "low" or "common" connections of each channel. The "high" of one channel must be used as the high signal path of the differential channel and the "high" of the other channel must be used as the inverse return wire or low signal path, as shown in the figure.

In addition to the two channels, it is also a lot easier to do this on a two-channel FAWG that has channel tracking capability, like Agilent’s 33522A two-channel function/arb waveform generator. This feature gives you the ability to create an inverted mirror image of the output signal from channel one onto channel two, which is exactly what is needed to create a differential signal. Also, this capability means you only have to set up the arb or built-in waveform on one channel and the inverted version of the waveform automatically tracks to the other channel. Without this feature you would have to setup an arb or built-in waveform on both channels and try to output them in sync using triggering.
As an example I measured and captured three signals with a differential input high-resolution digitizer. The example signal we used was a squarewave at 500 KHz. The figure below shows a digitizer screen shot of the signals. The three signals:
  1. Signal in yellow is a differential signal from the output of the differential amplifier connected to the single-ended FAWG
  2. Signal in green is the differential signal output created by the two channels from the 33522A
  3. Signal in purple is the output of the single-ended FAWG before the differential amplifier input


As you can see from the figure there is quite a bit of ringing on the differential signal created with the custom hardware. When I built my diff amp circuit I was careful to keep wiring as short as possible and I provided a large ground plane. Now with further time and engineer effort I could probably further improve the signal integrity of the circuit. But the point of this example is to show you can save test time and achieve better signal quality by using a 2-chan FAWG with tracking to create a differential signal. Also the cost of a 2-chan FAWG is still typically much cheaper than a differential output waveform generator.



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  89. Apart from these issues, you may encounter a few more problems while trying to login. However, before moving on to them, it is wise to learn some guidelines for creating a strong and well shielded password. These tips recommended by cyber experts can prove really beneficial.

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  90. Malwarebytes is an anti-malware software for Microsoft Windows, macOS, Android, and iOS that finds and removes malware from computer. Malwarebytes is a better replacement for an antivirus. To download and install Malwarebytes on your Mac device, Open Internet browser and search for Malwarebytes for Mac.

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  91. Webroot.com/safe (Webroot Inc.) provides internet security for home and business purpose. It gives users proactive protection against modern threats. Also, it offers a diverse set of threat intelligence services that span URL, IP, file, and mobile threat vectors

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  92. Thanks for posting this valuable information, really like the way you used to describe. Hope I'll get such posts in future too.

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  94. Online Website With reting the highest victory and giving many alternatives so that no one feels difficult to access into the website. And it has been guaranteed with the most wins.

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  95. I am a Software developer in United states of america if are You looking for software installation help or other support then you can contact with me. Visit my websites Thanks

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  96. Hulu provides the simplest way to stream entertainment to your TV. On your terms. With thousands of available channels. We provide information regarding Hulu Activation Code. Go to hulu.com/activate, and enter the Activation Code.

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  97. Webroot security is a great antivirus program, which amazingly lightweight tool with accurate URL blocking and powerful bonus features.

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  98. Roku.com/link helps to easy step by step guide to activating the Roku streaming device using roku.com/link.this link provides by Roku official website my.roku.com/link.

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  99. Webroot.com/safe is excellent for Windows PC/Laptop, MAC. Using your webroot key code retail card and get install easily on your devices. For the Installation of the product , Go to URL : webroot.com/safe and then put the code...

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  100. mcafee.com/activate - Get started with McAfee Security. Step 1. Enter your code Step 2. Log in; Get protected Step 3. Enter your 25-digit activation code. Go for more mcafee.com/activate .

    Setup Norton from norton.com/setup by entering 25 digits activation key. Visit norton.com/setup for downloading, installing and activating the best security products of Norton on your device.

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  101. Roku Activation Code is a unique four digit pin which is essential in the activation process. Once you have created the account, go to roku.com/link and the enter the activation code in order to link your account to the device.

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  102. McAfee.com/Activate Since the world is developing each day with new computerized advances, digital dangers, malware, information, and harming diseases have additionally turned out to be increasingly more progressed with every day. These digital contamination's harm a gadget or documents in different ways. McAfee.com/Activate  follows the concept of refine your system, you don’t need to worry about data loss or system failure because of the malfunctions. McAfee.com/Activate   works finely on every system including android and ios and supports device like, computer, laptops, mobile phones and tablets.

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  103. Thanks for sharing this post.It is very informative and helpful.

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