If you do not allow these cookies, you will experience reduced relevant content.I'm reading an EE book that references SPICE so to follow along on my linux machine I installed ngspice. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. They may be used by Analog Devices to build a profile of your interests and show you relevant content on our site. Targeting Cookies: These cookies may be set through our site by Analog Devices and our service providers. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance. All information these cookies collect is aggregated and therefore anonymous. They help us to know which pages are the most and least popular and see how visitors move around the site. Performance Cookies: These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. If you do not allow these cookies then some or all of these services may not function properly. They may be set by us or by third party providers whose services we have added to our pages. Functional Cookies: These cookies enable the website to provide enhanced functionality and personalization. These cookies do not store any personally identifiable information. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. Strictly Necessary Cookies: (Always Active) These cookies are necessary for the website to function and cannot be switched off in our systems. After we finish updating our website, you will be able to set your cookie preferences. meas statements to include the efficiency calculations.Īnalog Devices is in the process of updating our website. The Spice Error Log contains data points for the. Once the simulation completes, right-click one of the windows, select view and select Spice Error Log (or use the Ctrl+L hotkey). Please see the help file ( F1) for more details on. The final expression calculates the efficiency using the param directive for clarity. Please note the current direction convention for the input voltage source, V1, is into the device, hence the negative sign in the Pin calculation. Add the following expressions as a SPICE directive to calculate the average input power ( Pin), average output power ( Pout) and the efficiency ( Eff). meas command is useful for measuring a range over the abscissa (as well as one point on the abscissa). tran statement below, we start to save data at 2ms and stop at 2.1ms. Use this observation to set the the “time to start saving data” and “stop time” to encompass a short duration within the observed steady state period. step command, extending simulation stop time if needed. To ensure this, simulate your circuit, and note when steady state is achieved for all conditions in the. It is important to calculate efficiency when the circuit is operating in a steady state. step command to allow for the creation of this user-defined variable. Here, we step the independent current source, I1, from 0.2A to 1.2A in 0.1A increments using a global variable defined as. (You can use the S hotkey to add and place a SPICE directive.) step command into your schematic as a SPICE directive and step the independent current source from a light load to maximum current load and define the step increments. These steps can be defined as linear, logarithmic or as a list of specific values. The variable can be temperature, a model parameter, a global parameter or in our case an independent source. step command is useful for sweeping a variable across a range of values in a single simulation run. & amp lt img src='' alt='SMPS Efficiency Schematic'& amp gt
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