I'm looking into changing a transimpedance amplifier (TIA) from a thick film gain resistor to a thin film resistor. I see a thin film resistor shows -20dB on their datasheet (MIL-STD_202 method 308), but I haven't seen this spec on a thick film datasheet. I see MIL-STD-202 has the noise...
What is the advantage of cone shape APC (angle polished connector) in the FC series over step shape? I see lots of info where step is easier to polish and easier to work with (our own experience included). Why would someone chose cone shape?
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Is it possible (plausible?) to use Circularly Polarized (CP) antenna in a Synthetic Aperture Radar (SAR) array? My initial study is showing my smallest CP antenna has outer dimensions of lambda/2, and my SAR processing constraints need the antenna placed at lambda/2 intervals (pitch). That...
Our equipment is certified for Class I Division 1 usage in the USA via UL 913/60079-11. The Associated Apparatus has a CE Mark and we self certify via the Low Voltage Directive (2014/35/EU), with supporting documentation from recognized test houses.
We are looking to upgrade from UL 913 to...
https://www.researchgate.net/figure/Blocker-and-Signal-levels-along-the-Receiver_fig4_261234760
I'd swear back in the early '90s I learned this as a Signal Flow Diagram (SFD). It is useful to track the noisefloor, headroom, and dynamic range in a receiver. If you Google SFD, you see the...
Anyone know of good techniques to get an estimate/verify in software of the Ethernet cable length between two ports? IEEE 1588 PTP looks like it has the proper parameters to get a ballpark estimate, if that data is available above the PHY.
A few years back I was working with a Fluke tester...
I've been told that North America has reduced standards for plastic enclosures in hazardous environments (Class I Division 2 (Zone 2) Group II environment for example) as compared to the ATEX standards for Europe.
Can someone confirm this? I don't see this deviation in UL 60079-0 7th edition...
I've been told that in North America plastic enclosures are not considered hazardous for a Class I Division 2 (Zone 2) Group II environment, but the ATEX standards for Europe do consider static discharge off plastic enclosures.
Can someone confirm this? I don't see this deviation in UL...
I’m a bit rusty on my S-parameters and I ran into something interesting (about 9 questions worth). I’m attempting to determine the leakage inductance on a transformer. Measuring the inductance at the switching frequency is straightforward, but the only equipment I can measure with at the...
A colleague recently inherited a project where ground and chassis ground got intermingled on the secondary of the power supply long ago, so several hundred sensors are basically wired to chassis ground. While this works (surprisingly, to me), they've now found that when they plug into a GFCI...
I'm seeing something odd in an isolated flyback power supply. Per my understanding, an isolated flyback needs a capacitor from the primary return path (lets call it GND) to the secondary (isolated) return path (lets call it GNDI) to give the return current a path other than chassis/earth...
I have a high impedance PCBA design with 140V signals and I want to ensure the leakage current between traces are under 1.4 uA (100 Megohm, 10^8 ohms), mainly for crosstalk and drift. Can anyone suggest a good process for achieving this?
My PCB assembly manufacturer is currently using a...
I'm working on a circuit where I want to be able to use flyback transformers from two different manufacturers. For reference, Halo TGSP-P028EFD20LF is one of them:
http://www.haloelectronics.com/pdf/30watt-akros.pdf
The two transformer pinouts are very similar, as both have dual secondary...
This is continuing the discussion started in thread240-309895
Are there any guidelines for the value of the bypass capacitor from the primary to secondary of a flyback transformer to eliminate (reduce) the common mode currents that can cause EMI issues?
Other than stating that the capacitor...
Looking at thread240-431670, I noticed the through hole resistors and was intrigued.
While this is probably an old design, I just checked and Panasonic only rates their 2512 SMD packages to 200V continuous, 500V peak (per ERJ2GE0R00X.pdf). Do we EEs still need to use through hole parts for...
We integrated a new 6-port GigE switch integrated circuit into our circuitry to replace an older 4-port switch. Everything works well on the bench but the board has an integration issue with an adjacent board (also new) that also works well on the bench.
With my PC set to GigE, when the...
There's a fairly common guideline for GigE/100M Ethernet PCB routing on the web (that I won't mention here, yet) that states to "keep the differential pair trace lengths matched to 5 mils (0.005 in, 0.127 mm)". Does anyone know the basis for that? It seems like a really nice design goal ("if...
So my salesperson is talking about selling units of our test equipment into China and Brazil. In planning for this, I'm setting up CB Scheme documentation with a Notified Body. Does anyone have experience with selling into these countries? Will I need to repeat safety testing (IEC 61010) and...
I vaguely recall that the ENIG (Electroless Nickel/Immersion Gold) finish on a PCB starts to have a lot of attenuation at high frequencies (from the skin loss in nickel or the thin gold layer?). Can anyone point me to documentation about that effect, or tell me what frequency range it affects...
So this is a continuation of my thread from over 5 years ago - thread248-266906
So we designed a LVDS receiver channel into a controller along with several other communication channels. An opportunity has come up where I can run 5 channels (cables) for 30m from the sensor to the controller in...
