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MOSFET AMPLIFIER - Learn LTSpice: A Tutorial

MOSFET AMPLIFIER . I shall chose one of the mosfets from the list of LTSpice library. It is IRLML6346, an International Rectifier device and the data sheet can be found here: Key features of the MOSFET : IRLML6346. 1. Maximum Drain-Source voltage (VDS): 30V. 2. Gate Threshold voltage (VGS)(TH): V. 3. Maximum Drain current (ID): A. 4. Maximum Power Dissipation (PD): W. Sajjad Haidar Transconductance Let us use LTSpice to find the transfer characteristics of the MOSFET . To do this the following schematic is drawn: ID. In the EDIT. SIMULATION VGS. window, we may use the Directive, which varies V1. fro 0 to with Pressing RUN button gives us step size From this graph we will find out the transfer characteristics, More commonly known as Transconductance: . Sajjad Haidar Transconductance We can see that the transconductance, gm varies as VGS varies.

Let us consider, we are using 5V supply voltage (V1). We are going to use this circuit diagram. First we have to choose the Value of R3. Let us consider V D =2.5 V, to get the maximum output swing. So, voltage drop across R3 = V1-2.5 V = 2.5V. Current Id should be less than that can be handled by the MOSFET. Let us consider the value of R3=100 Ohm.

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