The measured values from this last row would be considered as VGS(on), ID(on), VDS(on), and Ros(on). 6) Take the measurements obtained in the last row of your table to find an experimental value of Ros(on). For each new value of VGG, you would measure the corresponding pairs of ID and Vos. 5) For the next several measurements, you would keep increasing VGG in steps of 0.1V. Measure the corresponding Vps and record into the table into the 3rd column. 4) Write the VGS(th) to the table, when current lp becomes around 1mA. We will consider reaching VGS(th) when the current becomes around 1mA (it could be somewhat below or above 1mA when you observe it). However, when VGG reaches VGS(th) the current will appear. Slowly increase VGG in steps of 0.1V while observing the current Ip. Since you have one DMM meter in the lab per bench, the current lo and voltage Vps needs to be measured sequentially. 1) Consult the data sheet on 2N7000 MOSFET transistor to fill the table below with typical (average) listed values. When experimenting with these devices in our lab, we do not necessarily recreate (measure) under the very same conditions, hence our results would diverge somewhat from the quoted values. gate threshold voltage was measured with the following setup conditions: Vos=Vgs, lp=1mA). Note, that all above characteristics had been measured under certain conditions (e.g. If your graph looks incomplete, you may want to try deleting the equation, adjusting the range, and re-entering it to see if you can improve the results of the search for initial values.Transcribed image text: Lab 10 - MOSFETS CHARACTERISTICS A MOSFET transistor (2N7000) has the following “ON CHARACTERISTICS”: Gate Threshold Voltage VGS(th), Static Drain-Source On-Resistance Ros(on), Drain-Source On-Voltage VDS(on), On- State Drain Current ID(on), Forward Transconductance gps, and many other characteristics that we will not explore in our time limited experiment. (Because many graphs consist of disjoint "lobes" and the ODE approximation cannot be run through sections of the curve with vertical slope, often multiple initial values must be found in order to draw the entire curve.) Under some circumstances, the initial value search may miss one or more "lobes" of the implicit function. #Graphmatica equations code#I am still perfecting the code that searches for initial values for the ODEs. However, because the transformation into an ODE requires computing the partial derivatives of the original implicit function with respect to both x and y, this method is not supported when your equation contains non-differentiable functions like int() and abs(). You can draw almost any graph using an implicit function. If you have an idea of where the graph should appear, you should focus the grid on that region before you enter the equation. Because the program only searches for initial values for the approximation within the current grid range, the grid range at the time you enter the equation is very important to the success of the graph. Instead, the equation is transformed into an ordinary differential equation and plotted by approximating the solution to the ODE. Since there is no easy way to solve these equations for either variable, the standard equation graphing routine cannot be used in this case. Graphmatica Help - Implicit Cartesian FunctionsĬartesian equations in which neither x nor y can be isolated (because there are two or more instances of each variable) are known as implicit functions.
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