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LT5538 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range FEATURES ? ? ? ? ? ? ? ? ? DESCRIPTION The LT 5538 is a 40MHz to 3800MHz monolithic logarithmic RF power detector, capable of measuring

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Get everyone they for simple RF power meter and bit about power measurement in general it#39’s a really simple circuit Put it together on this little onboard here you can see I've got an SMA connector and circuit diagram simple#39’ve got a 50 ohm load because most things in RF are measured in 50 obesity#39’s just easier most test equipmentsdesigned for that their#39’s a long history and quite an interesting tale about why50 ohms was picked you could probably look it up on the web and yeah have good read about it anyway RF comes in is terminating to this 50 ohm resistor soil will develop a voltage across that 50ohm resistor, and we use a low capacitance Shakti diode to pick off the peak voltage and charge up a capacitor we get some DC voltage across this capacitor which is essentially the peak voltage of the RF waveform across this resistor minus the forward voltage drop of the diode also as the frequency increases the capacitance of that diode starts to become significant and this termination no longer looks like a pure of 50 ohm resistance the on for this diode is probably like to pick a farad something like that so for low frequencies HF it's fine as you get pinto VHF it starts to become more problematic, and you need to compensate for it either just by calibrating it or yeah measuring in some way or actually modeling and maybe putting compensation that work in front of it there are other ways to measure RF power on my website I will link to it thereat log chips which are quite useful because they give you much more dynamic range for small voltages where the forward voltage drop of this diode is quite large with respect to the RF voltage developed across the resistor you start to get major errors and generally don't use this scheme below you know — I guess - 10 – 20 dBm maybe you can use diode in the square law region, but that's the entirely different subject, and we could talk about that later suffice to say this is for power ranges in the know the milliwatt -10 to 100 milliwatts the actual resistors that I put on here 1/4 of resistors I put 4 200 ohm resistors inparallelalso their#39’s you know 50 arms effective and reasonable power and I think that quite a lot, so this is basically a 1watt dummy load with a diode off it, so you can pick off the voltage okay, so this is often confusing to people this RMS ideas RMS is kind of a way of defining an equivalent voltage that would put the same amount of power into a load as what you know the real is a DC voltage basically that would do the same work San AC voltage you can imagine it you#39’ve got an AC waveform that's a puresinusoid here, and you bulldoze if you flip everything around the axis so that you know basically ideally rectify it Soyuz#39’ve got hump hump hump, and then you come along with to bulldoze, and you flatten it off so that you fill it up to be a perfect DC voltage if you did thatyou'’d find that it's you know 0.707times the peak voltage of the AC waveform you can do the math...

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What is lt5538?

The LT5538 is a high-accuracy RF power detector.

Who is required to file lt5538?

Manufacturers and distributors of RF power detectors may be required to file LT5538.

How to fill out lt5538?

LT5538 can be filled out electronically or by hand, following the instructions provided by the IRS.

What is the purpose of lt5538?

The purpose of LT5538 is to report information about RF power detectors to the IRS.

What information must be reported on lt5538?

Information such as the type of RF power detector, sales figures, and other relevant details must be reported on LT5538.

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