The optimum region for the JFET is in the region Choosing the Operating Pointįirst of all, we want the amplifier to work in a linear region to minimise the amount There are a number of factors to consider when picking the Now that we have the characteristic I-V plot for the device, we can choose a DC operating Successive curves have a gate-source step voltage of -0.5V The DC Operating Point and Load Line The topmost curve is for a gate-source voltage of 0V V GS plot for the 2N3819 n-channelįigure 1a - The Spice I D vs. Shown below is the transfer characteristic I D vs.
J1 as a function of VDD (the drain voltage) and VG (the gate voltage) as these To the schematic above it instructs pSpice to plot the drain current in Fortunately, it is fairly easy to convert a schematic diagram The schematic is just for the convenience of a humanĭesigner. Typical device will respond, and not a measurement as such. It's important to remember, this is a prediction of how a Out I-V characteristics of the device J1 corresponding to pSpice's The circuit below entered into pSpice will let us plot
The results are only as good as the model used
#Pspice multisim professional
Used by professional designers, but it is vital to remember: This is a remarkably effective approach, widely In the results and plots shown below, we are relying on a numerical model to
#Pspice multisim simulator
The pSpice simulator encapsulates device measurements suchĪs these in a numerical model, which may comprise many parameters. Device characteristics - the data sheetīefore you begin a circuit design, it's useful to study the device characteristics forĮvery device has slightly different characteristics which must be accounted for in yourĭocument format) contains characteristics and graphs for a typical device,ĭetermined by the manufacturer from measurements on a large number of.Simulating a FET amplifier Simulating a FET Amplifier with pSpice Contents
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