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Hi,
I want to design a test system with a multitude of modules that can deliver signals (DC and audio frequency AC) to, and measure signals ((DC, audio frequency AC and RF) from a unit under test that also consists of several modules.
As the modules of the unit under test share a common ground...
Hey,
if there is a high impedance circuit node, it's a good practice to surround the connected PCB pads and traces with guard ring structures and driving them with an as close as possible voltage with a low source impedance in order to prevent charges or leakage currents from reaching the high...
Ah, I forgot about the accumulation. Thank you, that was definitely helpful.
So it would actually be disadvantageous to apply a more negative gate bias, contrary to what would be advantageous with JFETs.
Ok, where can I find these "symmetrical lateral FET" as discrete ones with Rds of about 1...
If the OP would reverse the diode polarities, the OP bias current could flow through the diodes and even generate a nice little forward bias. The temperature dependency would actually compensate a bit for the temperature dependency of the diode detector ;-)
Guys, 3µA through 1Megohm makes 3V.
The 550mV at the inverting input is obvious with supply voltages of +-6V and a gain setting of 11. Just the Output hanging on the positive supply divided by the feedback divider.
But why is the non-inverting input only at 549mV?
The input protection diodes...
Yeah, only I don't need the highest value but the actual one with negative Vgs.
Or at least an indication on how the capacitances will behave with negative Vgs.
Will Ciss and Crss at Vds=0V and Vgs=-5V be similar to their values at Vds=5V and Vgs=0V?
Or will only Crss be similar because the...
Hey,
There are many mosfets for switching purposes, sometimes two of them conveniently packed into a single package.
Most of the times the datasheets provide data on the capacitances (Ciss, Coss, Crss) over drain to source voltage (GS shorted) and very few also provide data on the capacitances...
Thanks for mentioning that. It's interesting that smaller footprints can actually lead to better results in certan circumstances.
Great advice. They actually have the Pro version free for some time. Don't know if I am really using Pro features, but I can play around with the recommended...
Yeah, that doesn't really solve my problem.
Recommended footprints i do have (from manufacturer, JEDEC etc).
I also can make my own ones. The question is: How far can I shrink the pads but nevertheless get an acceptable soldering result?
Just to give some info ahead: Convection oven, air...
Hey,
For most of the SMD components we use, the manufacturers provide recommended footprints (pad layout geometry).
I assume they were designed to offer optimum soldering results with a high margin with various surface finishings on components and PCB, a wide variety of processes like...
Look, I just thought there might be an affordable IC out there that was similar to the MC14504 but with a more streamlined pinning.
If someone knows of such an IC I am happy to hear about it. That's all.
It is a multi-layer pcb, but every added layer increases the cost even further.
Also the vias pollute other layers unless I order blind or burried vias and that gets really expensive.
I need up to 1MHz, so rise and fall times should be below 250ns
Sorry, TTL was misleading. The digital signals...
I have to drive something that needs the 15V. While there are buffers with high voltage tolerant open collector or open drain outputs, this will have either slow rise times if I use high value pull-up resistors or high current with low state outputs if I use lower value pull-up resistors...
Hey,
I am searching for a CMOS buffer (inverting or not) that accepts 15V suply, LVCMOS or TTL input levels (threshold around 1.5 to 2V), just like the CD4049, MC14049 and so on, but with layout friendly pinning (inputs on one side of the package, outputs on the other side).
I'd take tri-state...
Hey,
I want to bring USB 2.0 signals from a backplane to Eurocard boards.
The boards have DIN 41612 connectors with three rows of pins.
Can I bring the USB signals to the boards through these connectors?
I thought about using 12 pins of a 3 by 4 matrix: 4 times GND on the first row and 4 times...
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