All Questions
131
questions
6
votes
1
answer
558
views
Will this over-voltage protection circuit work?
I am designing a PCBA that is powered from an AC adapter supplying + 19 VDC to the circuit. I want to add a protection against over-voltage, let's say up until + 24 VDC. I came up with the following ...
- 317
1
vote
2
answers
112
views
Why simulation of single NMOS/PMOS on LTspice has big difference with manual calculation using Level 1 Standard Parameters?
I am researching the mode of operation on PMOS and NMOS using Level 1 standard parameters.
This is the information of the NMOS circuit to be designed.
Using transistor model level 1 parameters, ...
- 41
0
votes
1
answer
54
views
How to interpret MOSFET connections and voltages
I have a few simple question about MOSFETs on how to interpret their symbols and how the pins and gate voltage are defined.
• I see symbols with the Source shown on the top and Drain on the bottom, ...
- 91
1
vote
1
answer
161
views
CMOS (Energy Supply of voltage) [closed]
Can someone please explain why, when \$ln\$ is transitioning from low to high, the energy supplied is \$C_{vdd}\cdot V_{dd}^2\$?
0
votes
1
answer
192
views
PMOS configured in common gate
This is an NMOS configured in common gate:
I am trying to understand what a PMOS configured in common gate would look like. Would Vin and Vout be reversed in this case? So, would VDD be connected to ...
- 339
0
votes
1
answer
125
views
How is the total gate charge of a MOSFET affected by the temperature?
For P- and N-MOSFETs, Vgsth will decrease (in absolute value) when the temperature rises.
What is the impact of the temperature on the total gate charge for P- and N-MOSFETs?
What is the order of ...
- 314
1
vote
2
answers
490
views
How to make a PMOS work as a constant current source?
I have a circuit in which, the PMOS is biased to a voltage source, the gate voltage, V1, of the NMOS below varies based on the functioning of the analog circuitry before. Because of this, the current ...
1
vote
0
answers
89
views
Electric-lock control via NMOS matrix
Currently I am working on the design that allows to control 8x8 electric lock matrix via PIC16F877A.
As in comments for somebody it was not obvious (btw it was mentioned) I am using 64 electric locks ...
- 13
0
votes
1
answer
245
views
the inverter switching point
As we know the mobility of the "nmos" device is 3x greater than "pmos", and when we want to correct the switching point of an inverter for vdd/2 we usually change the W of the &...
0
votes
1
answer
45
views
R5613L understandig what MOSFET to use
I want to add a battery-protection to my circuit including a switch to disconnect the battery from the rest. I found the R5613L from Nisshinbo (Manufacturer product site with datasheet).
On page 26, ...
- 339
1
vote
1
answer
107
views
Current flow in PMOS when not active
how can it be that Q2 is active when VA and VB are HIGH?
If I understand correctly, a current (shown in yellow) should flow...
But that is in my understanding not possible because both NMOS are ...
- 13
2
votes
1
answer
330
views
Benefits/downside of discrete high-/low-side NMOS/PMOS and high-side bootstrap NMOS switching circuit
What are the key features or rather benefits/downsides of these discrete switching circuits in comparison:
Low-side NMOS
High-side NMOS
Low-side PMOS
High-side PMOS
Boot-strap NMOS circuit
The basic ...
- 551
0
votes
2
answers
128
views
Is there anything wrong with using large values for L/W for a PMOS?
Worked on a project recently for a linear circuit design course.
Professor gave us the requirements to build a 5T OTA circuit which must have a gain of 30dB, unity frequency of 200kHz, etc.
Designed ...
- 209
7
votes
2
answers
470
views
What problem is solved by using a PMOS for reverse polarity protection instead of an NMOS?
Many resources suggest the use of a PMOS for reverse polarity protection instead of a diode, as it decreases losses. However, the characterstics of an NMOS are better than a PMOS, so why is using it ...
- 888
5
votes
4
answers
570
views
Low-side NMOS switch circuit
I built this circuit trying to learn how to drive a single HY3912W MOSFET. In the simulator, it acts as I expect.
I built it.
When I applied 6V to VAG and 5V for 1-second pulse to PWM every time the ...
- 339