Mos amplifier mismatch
There is a question on my textbook..Analyze in a detailed manner the effects of the mismatch in the differential amplifier MOS.Which one has a dominating effect according to you and why? I know how to...
View ArticleUsing a SMPS converter IC as a controller
I’m building an LED driver using the LM3410. The internal switch supports a current of about 2A which should be adequate for my needs, but if I need more, can I use an external MOSFET to act as a...
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LiPO reverse polarity protection with P-Fet & charger
I am trying to use a P-FET to protect my circuit against reverse polarity like such: Now i would like to add a LiPo charger to this circuit. Can i just add it after the P-FET (@+Vbatprotected)? will...
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Plot Vx as a function of time
I am stuck with this question. According to my analysis Vx = -3V when Vin = 0V. But I cannot interpret the voltage at the gate since there is a voltage of 0V due to Vin and +3V from the capacitor. So...
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Controling the Voltage of alternator
I want to design a circuit to control the output voltage generated by car alternator in a way that it shouldn’t allow voltage to exceed 15V and also when the output voltage of alternator is less than...
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How does a junction-less transistors work?
I have recently read in a book that in 2010,junction-less transistors were developed. I can’t understand how a junction-less transistor can be used to amplify current or voltage with having any...
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What is this circuit equivalent to?
Connecting a small-signal N-channel MOSFET and a power NPN BJT like this darlington-ish configuration, what does it produce? Is it equivalent to what people call IGBT? What about its P-channel...
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Why are my MOSFETs burnt?
I have been doing some project which worked for few months and then MOSFETs started burning. Here is detail of schematic: So, we are using: NTD4963MT4G MOSFET (datasheet) TLC5940 some 1k and 10k...
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Wrong MOSFET transistor model? MultiSim
I am designing a circuit that switches between 2 power supplies, controlled by a MCU. The circuit is the following. This is for a simple supply line, so it will be duplicated for both PS. As you can...
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problem with driving the mosfet through optocoupler
I want to run the mosfet (irf540n) through opto coupler(4n25) for driving the motor. I refered some formula from this website, but my circuit is not working. I calculated opto coupler current limting...
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derating of MOSFET
I am trying to study a MOSFET for a space application. One of the things I have to do is study the derating analysis for a MOSFET. I am refering the document obtained from ESA site – ESA site link. I...
View Articlesine wave inverter [on hold]
Gd day evrybody.. i am trying to change a square wave inverter that i have to sinewave.. i programed atmega 328 to drive the half bridge mosfet irf064n.. atmega connected to gate through 200ohm...
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Which mosfet description (pictures provided) is more accurate?
I was reading my physics book and found a description of mosfets that was different than the one I’m used to. Here is the picture from the physics book: In summary the physics book describes it’s...
View ArticleHow to design Digital logic gate using TFET logic?
In my recent project, I need to design digital logic gates using TFET instead of CMOS logic. Can someone Suggest any simulator or procedure which support design using TFET logic?
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How to prevent internal MOSFET from being precgharged?
For MOSFET circuits: simulate this circuit – Schematic created using CircuitLab Say, how do we make sure that the gates M3, M4 are never pre-charged, so that they will always produce the right result...
View ArticleHow well can SPICE model the physics of a MOSFET
I want to know how well SPICE can model MOSFET in the most fundamental level. I mean from just from the drain current models, when analyzing common amplifiers, would it be able to graph the swaying of...
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Solenoid doesn't actuate when driven through MOSFET
I’m trying to drive a solenoid with a GPIO on a Raspberry Pi. Here’s the schematic: The current through the solenoid and MOSFET should be: So the voltage drop across the MOSFET should be: leaving us...
View Articleinvert mosfet gate
Is there any way to invert the gate voltage of a mosfet. Weird question, but english is not my native language. I mean: Can I turn OFF a mosfet by applying a voltage at the gate?
View ArticleNeed a P channel depletion MOSFET with continuous current of 2400mA [closed]
Can you guys recommend me some PFETs for Q2 in this circuit 1 (figure 2) that I can use to get continuous current flow of 2400mA? My segment current is 300mA, so I’m looking at 300mA X 8 = 2400mA for...
View ArticlePowering LED Strip with Arduino using Transistor
I am trying to use the 5v output from an Arduino to control a 12v LED strip. I have an N-Channel MOSFET but I am confused on how to make it work. Here is the MOSFET Datasheet:...
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