{"id":3821,"date":"2019-09-27T07:49:29","date_gmt":"2019-09-27T05:49:29","guid":{"rendered":"http:\/\/medtech-ingenieur.de\/?p=3821"},"modified":"2021-08-06T14:36:59","modified_gmt":"2021-08-06T13:36:59","slug":"verwendung-von-physiologischen-signalen-in-schaltungssimulationen","status":"publish","type":"post","link":"https:\/\/medtech-ingenieur.de\/en\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\/","title":{"rendered":"Use of physiological signals in circuit simulations"},"content":{"rendered":"

As an engineering service provider in the medical technology sector, we cannot avoid working with physiological signals such as ECGs. We often want to take a closer look at how these signals affect a particular circuit.<\/p>\n

For the simulation of our circuits we use, among other things, the program LTspice<\/a>\u00ae<\/sup> from Analog Devices (formerly Linear Technology).<\/p>\n

LTspice is a free simulation tool for electrical and electronic circuits. It offers a range of options for signal generation, temporal measurement of voltages and currents, and simulation of amplitude and phase responses (also known as Bode plots).<\/p>\n

How exactly the implementation of a physiological signal in LTspice works will be explained in more detail in this article using the example of an ECG signal.<\/p>\n

In LTspice there is the possibility to save any signal as a so-called PWL signal (English: piecewise linear function \u2013 <\/em><\/strong>In this case, arbitrary voltage values are assigned to a specific point in time. To understand how PWL works, let's consider the following example:<\/p>\n

\"\"<\/a><\/p>\n

At time t = 0 seconds, we assign the value 0 volts, at time t = 1 second, the value 2 volts, and so on. Let's take a look at what this signal looks like over time:<\/p>\n

\"\"<\/a><\/p>\n

We get a trapezoidal signal that rises linearly to 2 volts for one second, stays at 2 volts for one second, and falls linearly to 0 volts for one second.<\/p>\n

Following this principle, we can now generate any signal using the PWL function in LTspice. For physiological signals, it's easier to use appropriate sources, such as the PWL. https:\/\/physionet.org\/<\/a> to use.<\/p>\n

What we need from there in this case is the .txt file containing the value pairs for the voltages and their corresponding time points. To use this in LTspice, it must be formatted as follows:<\/p>\n

\"\"<\/a><\/p>\n

The file must contain two columns separated by a space. The left column contains the time points, the right column the voltage values. The "m" after the number is the unit prefix "milli." So, "80m" means 80 ms, "1.5m" means 1.5 mV, and so on.<\/p>\n

To use these value pairs, we open LTspice and first create a circuit diagram as shown in the following figure:<\/p>\n

\"\"<\/a><\/p>\n

Next, we right-click on the voltage source (to open the settings), after which the following window appears:<\/p>\n

\"\"<\/a><\/p>\n

We click on \u201cAdvanced\u201d and this window appears:<\/p>\n

\"\"<\/a><\/p>\n

In this we select the item \u201cPWL FILE:\u201d and specify the directory of our previously created .txt file and confirm with \u201cOK\u201d.<\/p>\n

\"\"<\/a><\/p>\n

This is what it should initially look like. To start the simulation, click on the black figure in the top left.<\/p>\n

\"\"<\/a><\/p>\n

Another window will open. All we need to do is enter the "stop time" parameter (the simulation duration in seconds) and confirm with "OK."<\/p>\n

\"\"<\/a><\/p>\n

Our PWL signal is repeated exactly once:<\/p>\n

\"\"<\/a><\/p>\n

To repeat our signal several times, we right-click on the PWL instruction in the schematic and this window opens:<\/p>\n

\"\"<\/a><\/p>\n

Now we bracket the entire statement and write<\/p>\n

PWL repeat for X (PWL file = \u201c *File path<\/em>* \u201c)<\/strong> endrepeat<\/pre>\n
Where X stands for the number of repetitions, for example 2. It then looks like this:<\/p>\n
\"\"<\/a><\/p>\n
Now our signal is repeated twice. However, if we want our signal to repeat infinitely, we change the PWL instruction to:<\/p>\n
PWL repeat forever (PWL file = \u201c *File path<\/em>* \u201c)<\/strong> endrepeat<\/pre>\n
\"\"<\/a><\/p>\n
Our signal is now repeated infinitely.<\/p>\n
You now know how to integrate physiological signals, such as an ECG, into LTspice and simulate or test your circuits.<\/p>\n
 <\/p>\n
If you have any further questions, please leave a comment.
\nWe are happy to help you.<\/p>","protected":false},"excerpt":{"rendered":"
Als Ingenieursdienstleister im Bereich Medizintechnik kommen wir nicht darum herum, mit physiologischen Signalen wie beispielsweise EKG zu arbeiten. Wie dieses auf die eine oder andere Schaltung wirkt, wollen wir oft n\u00e4her betrachten. F\u00fcr die Simulation unserer Schaltungen verwenden wir unter anderem das Programm LTspice\u00ae von Analog Devices (fr\u00fcher Linear Technology). LTspice ist ein kostenloses Simulations-Tool […]<\/p>\n","protected":false},"author":17,"featured_media":3836,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,8],"tags":[157,359,362,364,360],"class_list":["post-3821","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardware-entwicklung","category-tools","tag-ekg","tag-ltspice","tag-schaltungssimulation","tag-signale","tag-simulation","post-wrapper","thrv_wrapper"],"yoast_head":"\nVerwendung von physiologischen Signalen in Schaltungssimulationen - MEDtech Ingenieur GmbH<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/medtech-ingenieur.de\/en\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Verwendung von physiologischen Signalen in Schaltungssimulationen - MEDtech Ingenieur GmbH\" \/>\n<meta property=\"og:description\" content=\"Als Ingenieursdienstleister im Bereich Medizintechnik kommen wir nicht darum herum, mit physiologischen Signalen wie beispielsweise EKG zu arbeiten. Wie dieses auf die eine oder andere Schaltung wirkt, wollen wir oft n\u00e4her betrachten. F\u00fcr die Simulation unserer Schaltungen verwenden wir unter anderem das Programm LTspice\u00ae von Analog Devices (fr\u00fcher Linear Technology). LTspice ist ein kostenloses Simulations-Tool […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/medtech-ingenieur.de\/en\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\/\" \/>\n<meta property=\"og:site_name\" content=\"MEDtech Ingenieur GmbH\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/medtechIngenieur\" \/>\n<meta property=\"article:published_time\" content=\"2019-09-27T05:49:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-08-06T13:36:59+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/medtech-ingenieur.de\/wp-content\/uploads\/2019\/09\/11.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1675\" \/>\n\t<meta property=\"og:image:height\" content=\"427\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"(Gast) Gleb Shenkerman\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@MedtechIng\" \/>\n<meta name=\"twitter:site\" content=\"@MedtechIng\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"(Gast) Gleb Shenkerman\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\\\/\"},\"author\":{\"name\":\"(Gast) Gleb Shenkerman\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/#\\\/schema\\\/person\\\/5fac2cd4bb5de49f5ab0060a14a049cb\"},\"headline\":\"Verwendung von physiologischen Signalen in Schaltungssimulationen\",\"datePublished\":\"2019-09-27T05:49:29+00:00\",\"dateModified\":\"2021-08-06T13:36:59+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\\\/\"},\"wordCount\":589,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/medtech-ingenieur.de\\\/wp-content\\\/uploads\\\/2019\\\/09\\\/11.png\",\"keywords\":[\"EKG\",\"LTSpice\",\"Schaltungssimulation\",\"Signale\",\"Simulation\"],\"articleSection\":[\"Hardware\",\"Tools\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/medtech-ingenieur.de\\\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/medtech-ingenieur.de\\\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\\\/\",\"url\":\"https:\\\/\\\/medtech-ingenieur.de\\\/verwendung-von-physiologischen-signalen-in-schaltungssimulationen\\\/\",\"name\":\"Verwendung von physiologischen Signalen in Schaltungssimulationen - 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