Questions tagged [nmos]

A n-channel metal-oxide semiconductor (nMOS) transistor has n-type carriers in the channel. A positive voltage on the gate turns inverts the substrate (PWell) creating the channel and turning the device on. The term may also be used to describe logic circuits built around nMOS transistors.

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2answers
71 views

Short in MOSFET between Gate and Drain

I try to understand a circuit, where this is a part of: To me this looks like a short between the Drain and Gate in the pmos at the top and nmos at the bottom. The line from the top pmos to the right ...
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190 views

Why did this MOSFET blow up?

I have a DC drill with adjustable speed. I would like to add a battery protection circuit which shut-downs the motor if the battery voltage is too low. I would like to use the built-in slide switch ...
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39 views

P-MOS controlled by N-MOS via MCU, resistor values

This is the schematic: For this switch setup to work, time delays even up to 50 ms is acceptable. How do I calculate/estimate resistor values? R1: Gate pull-up for P-MOSFET. (defaults to P-MOS being ...
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6answers
390 views

What affirms channel current direction in nMOS and pMOS?

In circuit designing, it is a common phenomenon to presume that in case of nMOS the channel current flows from drain to source (also seen in schematics), while in the case of pMOS, channel current ...
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1answer
35 views

Intuition for stability differences between PMOS and NMOS linear power supplies

Reading this question and the linked TI's LDO document led me to a more direct comparison between the two approaches: Notes: I'm using a separate V+ for the general purpose opamp to provide more ...
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Is “Peak NMOS current limit” the continuous output current limit of this LED driver?

I am trying to find the maximum current the DIO5661CD6 can supply to the LED(s.) I do not see the usual "continuous current" parameter anywhere in the datasheet. Is the "Peak NMOS ...
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29 views

NMOS as a pass transistor showing weird behavior when VG = 0. Please help me to understand. (Newbie in electronics engineering)

I used LTspice to simulate my circuit and used the monolithic NMOS transistor in the library. I thought the gate voltage being 0 means the transistor is switched OFF. In that case why isn't the ...
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3answers
36 views

Can I use the P3020L Mosfet with 5>Vgs>3 without any linear region consequences?

So I've been searching for a long time, for a power mosfet I can switch safely at a Vgs of 3V. I'd like to know if this is the one, because luckily, I recovered it from a computer power supply, thus I ...
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4answers
326 views

N-MOSFET driver for P-MOSFET high side switch

I need to create a high side switch to drive a 2.5W resistive load, which must be referenced to ground. I'm planning to use a P-MOSFET as load switch. The problem is there I have an inconstant voltage ...
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1answer
52 views

What happens if a voltage is applied to the gate of a MOSFET when both drain and source are shorted?

Can this damage P- or N-type MOSFETs? Does this affect gate current absorption? A side question: Instead of connecting D and S together and letting them float, what if they are both tied to ground, ...
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39 views

Explanation of capacitor usage in this N-MOS application

I'd like to understand why capacitor is used in this circuit instead of connecting PWM pin directly to N-MOS. How does Q3 have HIGH reference with no direct connection? What kind of advantage I have ...
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1answer
48 views

Bode plot starting from 180?

This is an NMOS common source amplifier and I'm trying to calculate the Phase Margin, but it's starting from 180 instead of zero? dose it mean I have poles at the origin or it's very stable?
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CMOS body voltage question

So I'm thinking in terms of the cross-section of this circuit, and I wanted to know how would I find the body voltage of M1 and M2 (which isn't shown on this diagram but I'm thinking in terms of the ...
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69 views

Can two IRLZ44N MOSFETs in parallel handle a current of 20 A without heat sink?

Can two IRLZ44N MOSFETs in parallel handle a current of 20 A without a heat sink? The Vgs command is a square wave at a frequency of 70 Hz. Do I need to attach two big heat sinks or not? Will my two ...
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Why is the arrow on this MOS transistor IC common?

The schematic below is of a CD4007 MOS transistor chip. From the schematic it can be seen that on either side, PMOS or NMOS, the arrows indicating what type of MOS transistor it is are all connected ...
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37 views

Driving an array of resistive loads on high side with as little parts as possible

I'm trying to switch an array of resistive loads at 12V as fast as possible using least amount of parts due to limited board space. I have tried to find sourcing darlington transistor pairs but they ...
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1answer
35 views

Least amount of parts to switch a resistive load [closed]

Excuse me for not being able to provide a schematic right now as I’m on mobile but my question is fairly straightforward. I’m trying to drive a bunch of resistive loads fairly quickly in a constrained ...
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4answers
111 views

I'd like to know if I can push 40 volts at 3 amps through an IRLZ44N MOSFET?

I already have the datasheet, it states it can handle 50 volts at 50 amps but I'm worried about spikes since I'm using it to switch the primary side of the transformer at 70 Hz and it will be a square ...
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2answers
55 views

How can I draw layout for 2 NMOS having different body potential?

I am trying to understand how I can draw the layout of the following circuit where the 2 NMOSs have different body potential. Any suggestion will be highly appreciated. Thanks!
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1answer
64 views

Wiring two separate circuits with separate loads (one with mosfet and Arduino) with a single bench PSU

I have a cheapo bench PSU with one pair of terminals on it and I am trying to wire the pictured circuit correctly and in best possible practice. As my description on the schematic says, one LED device ...
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1answer
73 views

Correct way to connect MOSFET's source with the circuit's ground

While practicing in Tinkercad, I stumbled on a problem that I'm not educated enough to solve so I have to ask here. The goal here is to have the LED powered by the power supply, and Arduino powered on ...
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90 views

Can I somehow make the LM7805 work hand in hand with an N-channel MOSFET to get more current out of the regulator?

I've seen the circuit with the LM7805 being used hand in hand with a PNP to provide more current. My problem is the heat that comes with said configuration. Isn't there a way to make a linear ...
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30 views

MOSFET diffusion to substrate capacitance

in order to eliminate body effect one way is to connect the substrate to source when the well is for a single device (PMOS with a well in a CMOS for example) , but i read that it increases the source ...
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60 views

When the NMOS is connected to VDD and turned off, why does it not block the current completely?

Here is a link to a Falstad simulation: Link to simulation 1 The NMOS is connected to the VDD, but when it is turned off we have VSD=0,435 V. Why is the drop not 1,2 V? The reason I don't understand ...
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42 views

Proving that we can apply the half-circuit model for the common-source differential amplifier

This is the circuit I'm trying to solve through the half-circuit model: To do so I need to first prove that \$V_{p}\$ is a small-signal ground under opposite symmetric excitation (\$v_{in1}=-v_{in2}\$...
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316 views

Why are the voltages the way they are in this transistor circuit?

This question is about what my book calls "transmission voltage" when an nmos is conncted to the power source, or a pmos is connected to ground. It has a hypothetical diagram ass shown: It ...
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3answers
75 views

Which voltage is lower, 0V or -1V for connecting a MOSFET's source terminal?

In an NMOS transistor the source should always be connected to the lowest voltage. Does this mean that if the source was originally grounded, but then the drain was connected to -1V that the source ...
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1answer
37 views

How much does Igss vary with temperature?

I was looking at a transistor (BUK98190-100A/CUX). I see that Igss is 100nA at 25C. How does Igss vary with temperature? Is there some way to guesstimate the max at 100C, given that the max at 25C is ...
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46 views

How to analyze this MOSFET H-bridge circuit?

In my university electronics course project, I am asked to analyze an H-bridge circuit. It is a simple H-bridge in which the motor is represented with a 37 ohm resistor and thus has no diodes. The ...
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60 views

Body effect on NMOS4 LTSpice simulation

I am trying to observe the effect of a negative voltage on the NMOS4 model in LTSpice. I have a DC sim running and a step parameter for the voltage. However the current curve (and threshold voltage) ...
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2answers
55 views

Finding output voltage of a MOSFET using its datasheet

Given a supply voltage of 4800 mV to a resistor loaded NMOS inverter with a single Nmosfet (2N7002) and a 6 ohm resistor, what would be the output voltage when the input voltage is 3500 mV? How should ...
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59 views

How temperature difference does not affect transistors in CPUs?

Recently I learned about semi-conductors and some devices. Today I watched a video on youtube about a guy overclocking a cpu to 7.0 ghz, while cooling it with liquid nitrogen to -192 celsius degrees. ...
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1answer
73 views

AM modulator's negative peak saturation issue

I am working on AM modulator. I am using NMOS as a voltage controlled resistance, and opamp in inverting aplifier configuration to get carrier signal multiplied by input signal. I created a simulation ...
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0answers
51 views

Bootstrap MOSFET driver not working

I have a problem with a circuit I designed and which I am trouble shooting at the moment. I am trying to generate 50 Volt pulses from a microcontroller to an NMOS with a Load attached with help of a ...
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1answer
47 views

Importing Third Party Models in LTSpice

I am trying to import the 2N3904 NMOS transistor in LTSpice but the program is not allowing me. I have pasted the model name in the spice schematic as shown below. The error message is : "cannot ...
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2answers
23 views

Is sum of currents equal to capacitor current for NMOS Inverter with Capacitor as Load?

I found this in my lecture notes and could not understand how drain current is equal to sum of load and (IL) capacitor currents (ICL) given in the figure for a NMOS Inverter with capacitor load. By ...
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112 views

How to fix an N-channel MOSFET that's always on, without using resistors

First things first: I'm very new to electronics Getting right into it: I am trying to use an N-channel MOSFET as a LED strip light switch, with 12V at 1.5A supplied to the source and 4.5V from a ...
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49 views

Help needed in understanding why a circuit invovling a FQU13N10L mosfet is not working

I am a relatively new to circuity and have had issues selecting the right mosfet for my circuit(see below). I am attempting to control the flow of 12V at 1.5A, from the source of my mosfet using 4.5V ...
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1answer
145 views

How to find Vthreshold and K (or beta) in Pspice/Orcad

Regarding M2n7000 transistor in OrCAD, I want to find its Vthreshold and Beta (or k) by its edit PSpice model. This is what I get : And by Vthresh and Beta (or k ) I mean the parameters of this ...
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1answer
46 views

Measuring switching time of 5LN01SP (NMOS)

I am working on switching time test circuit for 5LN01SP specification. This is my circuit: Input test signal is (as per specification) a pulse of 1kHz frequency: PW = 10us D.C. == 1% We can see the ...
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22 views

Performing switching time test with NMOS (5LN01SP)

I am about to feed my switching time test circuit with input signal from signal generator. In a 5LN01SP's specification input test signal is marked as: PW = 10us D.C. <= 1% (see the picture) It is ...
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3answers
425 views

What type of amplifier is this?

I have a question about the amplifier with circuit shown below: I don't understand if this is a voltage or a transimpedance amplifier. Can someone provide some explanation?
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1answer
79 views

MOSFET switch not turning off load

I am using a n-channel MOSFET (AO3400A) as a power switch. Circuit is below. The issue I'm facing is when the EN pin is 0V, the LEDs are still dimly lit. The voltage across the load measures about 2....
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1answer
128 views

Why does the Pinch-off Point in the MOSFET move towards the source as we increase \$V_{ds}\$?

Basically, I understand how the pinch-off region forms and I understand how conduction takes place even after the pinch-off voltage is reached. However, why does the distance between pinch-off point ...
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3answers
61 views

Understanding common-source amplifiers with resistive degeneration

I understand that by introducing the series resistance to the NMOS in the amplifier circuit the gain becomes: $$A_{v}=-\frac{R_D}{\left(\frac{1}{g_m}+R_s\right)}$$ Which means that higher values of \$...
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3answers
41 views

synchronous buck - nmos current flow direction

As far as I know in nmos the current flow from the drain to the source, and the drain and source are determined by the pin with the higher voltage on it (such that the source is the pin with the lower ...
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32 views

2 trnsistor mosfet in line

i tried to calculate the cuurent that flow into 2 trnsistor that conect in line. the drain of the first is conect to the source of the other. and they conect to the same Vd. one of them is l1=1010^-4 ...
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1answer
37 views

Using an NMOS as a switch for a 10V DC source in a 555 timer circuit

I used NI multisim and created a circuit with a 555 timer that will allow a diode to flash at a frequency of about 4HZ. This is the circuit: As you can see in the above image, the oscilloscope graph ...
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1answer
80 views

How to make NMOS resistance emulate a normal resistor?

I am trying to see the behaviour of an NMOS' resistance with gate-source voltage. This is my NMOS as voltage (Vgs) controlled resistor' schematic (I am doing DC sweep on V2 from 2V to 10V with step ...
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44 views

Increasing supply rails for low size MOSFETs

With decreasing sizes of MOSFETs, the supply voltage has also scaled down so as that the electric fields in the device are not large enough for them to breakdown. However if this depends only on ...

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