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If you put your free wheeling diode (D) across the inductor (L), the free wheeling current will never go back to the source, it only "turns" in the L-D circuit until vanishing due to dissipation inside D and L.
Re: Why Standing Wave is discuss only in RF Transmission Lin
After a period of 20mS your wave has travelled 6000km
Time period unit: second
Wavelength unit: meter
Re: Why Standing Wave is discuss only in RF Transmission Lin
Yes, the wavelength of a 50Hz voltage travelling conductors is about 300000000/50 = 6000 km. It has the same properties as others signals (rf, digital,...).
I think that you're confused with two things.
On the first hand is the...
Re: Why Standing Wave is discuss only in RF Transmission Lin
It happens of course (same physics everywhere) but as the wavelength is 6000[km], you see nothing. Only engineering long distribution power line takes this into account (for example, detecting the position of a defect along the line...
Thanks VSWR,
By DC, I meant 50kHz that is next to DC :-)
Thank you for the links. But in your low noise alternatives the lower frequency is 50MHz, is it possible to lower this down to 50kHz?
If not, is it possible to combine 2 amplifiers, the first for the 50kHz-50MHz BW and the second the LNA...
Hello,
I need a DC to 2GHz LNA with the lowest noise possible available.
I've selected the GALI-39+ from minicircuit, it's a DC-7GHz amplifier and it has a NF of 2.4 dB.
Since I'll use it between DC-and 2GHz (input blocking cap do the filtering), is it right that the NF will be lower than the...
Hello,
Thanks for your answers.
I think that we where wrong with the capacitor resonant frequency.
I made the equivalent circuit of a real capacitor (R-L-C with parameters C=100nF, ESR=0.08ohm and fc=10MHz) and I put this circuit at the input of a 50 ohm impedance system (LNA or whatever) and...
Hello,
I've to use a wideband LNA (like the ABA-53563 from AVAGO, it's a "internally 50-ohm matched silicon monolithic amplifier that offers excellent gain and flat broadband response from DC to 3.5 GHz").
My concern is that I've to pass the low frequencies as well, typically 50kHz. I calculated...
Hello,
I'm working in the LF-2GHz range (then wideband).
I've to sample the signal at a resolution of 1bit (then using a high speed comparator).
The problem is not the comparator itself, I can find a fast one. But after I've to latch the signal @ 4GS/s.
Since I can't find a fast latch, I've...
lna 2ghz
Hello,
For a PIN photodiode, I've to design a wideband LNA from low freg (+-1Mhz) to 2GHz. The gain have to be 40dB, NF ideally at 3dB.
I think that I've all the theoretical background to do this but since I've no experience with such frequencies I'm looking for advice, schematics...
using zigbee
What to do next??? There are a lot of things to do.
Learn Application Profile, cluster, device descriptor, attributes and commands, that's the fondation of ZigBee.
Learn what it's binding, then the binding tables on coordinator? or routers? or end devices?
What about fiability if...
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