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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.

AC signal to the amplifier and coupling a load at the output. For this we need two capacitors, one coupling signal to the Gate of the MOSFET, and the other at the Drain coupling the load as shown in the circuit. Let us first consider that the input signal is of low frequency like audio frequency (20 Hz –20 kHz); for this range the MOSFET Gate

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