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Hi FvM.
I missed that Vgs little detail. Good point.
I assume there are some significant transients on Q43. I need to do some more testing.
The battery is never disconnected.
I also found something but not sure is it is enough to damage the transistor.
When 12V rail is enabled, Q23B/Q24B are...
Hello everyone.
I´m having problems with switching mosfets.
Some of them appear to be damaged after some time, staying in ON state regardless control signal state.
The system is powered by a 7.2V lithium pack.
3V_2 rail is used to power an SD card.
12V rail is used to power 2 current loop...
Hello.
The point is that I am facing 2 main problems:
1) My system is battery powered, so I need low power stuff, 2-3 uA quiescent current as maximum in stand by mode.
2) The line I need to adapt is a serial bus running up to 115200 bps, so I can't think about a transistor based solution which...
Hi Klaus.
This is the graph showing driver VOH, for Vcc = 3.3V.
So here is the main question...VOH is a consequence of output current only, because output impedance I guess?
Hello guys.
I've got a driver running at 3V and a receiver running at 3.3V.
According to datasheets, these are threshold values:
Driver: VOH 2.4V min (4 mA)
Receiver: VIH 2.5V max. Input max current 0.5 uA
First thought is that they are not compatible but, are variations between min...
Hello everyone.
I have a 4 layer pcb with high speed signals routed on layers 1 and 2, so I'd like to remove unused via pads on layers 3 and 4.
If removing the via pads on layer 4 (bottom layer)...would the holes be properly plated or could it cause a manufacturability issue?
Thanks!!
Hello guys.
To improve power consumption on a battery powered system, I am planning to remove the termination resistor on a RS485 bus.
It will carry point to point communications (just two transceivers attached to the bus) at low baud rate and through a short cable (2 meters long).
I am using...
impedance control with different prepreg styles in a dielectric
Hello guys.
My layer stackup looks like the picture
Lets say that:
- Dk for 2116 is 3.4
- Dk for 7628 is 3.7
I need a 50 ohm impedance in layer 1 (layer 2 is ground).
For impedance calculations, how do I manage two different...
Hi guys.
I'd like you to have a quick look at the pics and leave a comment...
It is part of the RF section of a system with GPRS/3G communication capabilities.
The pcb layout shows a transmission line with a track width that is a bit narrower that component pads connected to it...
is this...
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