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What is the ground-source voltage of this current mirror?
In Neamen’s microelectronic book, there’s a problem using this current mirror There is a 5V DC voltage source above the current source. The reference current is 250 microAmp. The threshold voltage is...
View ArticleHelp on transistors or MOSFET in 8x8x8 LED cube
I am on a project to build a 8x8x8 LED cube having common cathodes in each layer. I have built the cube and now I have to build the main circuit. I am using my Arduino Mega 2560 to control it. I have a...
View ArticleDriving solenoid with Microcontroller with variable strength
I am working on an interface to trigger physical drums with solenoids. Therefore I need to not only drive the Solenoids Hi/Low, but also change the force – ideally using PWM for each individual...
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What is causing this level shift in my wave?
Excuse the quality, sorry; RED is GATE of Q2. YELLOW is GATE of Q4. 5V INPUT AT ALL STAGES What are possible reasons that my H-bridge has a little ‘bump’ at the turn-off of the high-side? It’s...
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Noise with PWM Motor Driving Circuit
I’m using the circuit of this question: Problem with PWM motor driver The problem of the past question is solved using a 1200k resistor and lowering the frequency to 4 Khz: now I have noticed, using an...
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How to determine the voltage on the drain of a “hanging” PMOS
This is likely a simple question that has an equally simple answer. Below is the associated schematic. The problem I’m having is identifying what state M2 is in, and what the voltage is at Va. I know...
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How to Find value of Early voltage of output characteristic curve of BJT?
I have this graph from data that I have. This is the output characteristic curve of BJT. I want to find the value of early voltage VA?
View ArticlePower MOSFET 27N3LH5 for SMT design
I want change existing through-hole type PCB design to SMT design. The existing design use Power MOSFET 27N3LH5 in TO-220(DIP) package and with Heat Sinks in output channels. The SMD version of 27N3LH5...
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How do you correctly measure the gate voltage of a MOSFET?
If you have a half-bridge, or an H-bridge, or some other usual configuration; and you want to see the voltage you are getting on the gate, to check for any errors and shoot-through. Do you do it like...
View ArticleWhen are Avalanche-Rated MOSFETs Necessary?
Why do we care about avalanche rating for power MOSFETs in circuits that exhibit inductive kick (flyback converters, motor drives, etc.)? I understand the basic destructive mechanisms behind avalanche...
View ArticleCMOS voltage swing problem
I modelled an XOR gate using HSPICE (Transistor level).Input voltage signal is 4V and Vdd of the circuit is 5V (threshold voltage= 1v). While giving input voltage 4v I got Maximum output voltage swing...
View ArticleDepletion-mode P-channel MOSFET availability?
I need a P-channel depletion-mode MOSFET for a circuit I’m building. However, there is no model available in LTspice that I have found, nor is there any available that I have found to buy online. How...
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MOSFET transistor
Circuit a) presents the circuit of polarization of a MOSFET and b) the equivalent model of small signal on $g_m$ is the transconductancy of the dispositive, and $r_0$ an equivalent resistance defined...
View ArticleDriving MOSFET with 555 timer [duplicate]
This question already has an answer here: 555 to drive a MOSFET 2 answers
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Common-Drain Amplifer vs OP-Amp for unity gain (voltage Follower)
What is the difference between using a nFET vs OP-Amp as a unity gain amplifier, i.e. voltage follower. Application: Provide constant voltage with a variable load, see example below: Min Current 0.1mA,...
View ArticleSwitching 12V/6A with an AVR – MOSFET or relay or both?
I want to control the 12V heating of an oxygen sensor with an ATmega328P. It draws about 6A when switched on when it is cold and about 1.5A at the operating temperature of 350°C. It is powered with a...
View ArticleMOSFET gate protection zener diode math .please help
My circuit’s voltage input can range from 6V to 12.6V. I want to use a p-ch mosfet for reverse bias protection. However, the FET I want to use has a maximum VGS of +/- 8V, so I have to protect it in...
View Articlehow to select right mosfet for my 500 watt or 1000 watt inverter (12 or 24 to...
I wan t to know that while designing an inverter how does we select Mosfet . on required Volt and current or required or drawn current
View ArticleDepletion-mode P-channel MOSFET availability? [duplicate]
This question already has an answer here: Depletion Mode MOSFET Modelling in SPICE 1 answer
View ArticleBody Diode of a MOSFET
So for some MOSFETs, specially with Power MOSFETs, the body diode is a flyback diode that (as far as aI can tell) can be conveniently added to the MOSFET’s bulk as there already PN junctions (correct...
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