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I was debugging a board that has two separate 5 volt DC inputs (A and B) which are intended to be plugged in at the same time to different supplies but only one supply will ever be on at a time, controlled external to this system somehow, but both inputs will have a power source connected with...
If I want to jumper an 0201 footprint in line with an output RF path between a PA and chip antenna (ZigBee 2.4 GHz) using a zero ohm, and I'm looking at +20 dBm (100 mW), how do I determine the power rating of the resistor, is it directly related eg I need a 0.1w jumper? Or is RF power totally...
Re: RF transmitter module current varies with physical place
I'm using a Keithley source meter to supply the 3.3v and measure the current at the same time since I also need to measure the 10uA sleep currents and required something accurate. I assume that would give good measurements and I'm...
Re: RF transmitter module current varies with physical place
I was about to try that, I have an 0402 50 ohm tight tolerance part I used recently. I noticed when I have the spectrum analyzer plugged into a test port the readings are only varying by 3mA if I try to disturb the board with...
I was trying to measure the current on the power supply of a 2.4GHz module transmitting at max RF power and I noticed that depending where I physically placed it on the bench and if I was touching the insulated power wires or not, or had my hand physically near the module, the current ranged...
I won't need to go through all kinds of analysis for my application. I only wanted to know if there's a show stopper with practical considerations of doing this jumpering of multiple paths at 2.4GHz since I don't have experience with it and some info out there makes it sound as if the time of...
I'll go with the 3 pin right angled jumper approach and see how it turns out. As soon as the layout is done we'll be ready to get samples made so soon enough I'll know if it works.
This is an example of what I'm trying to do and don't know if there's a problem with it or how to improve it. 2.4GHz 50 ohm trace coming in from the right side normally feeds to the L3/L4 antenna matching pad directly but we want to add J3 for a U.FL test port. The antenna or test port will be...
That was on our last iteration of the design but we've been directed to go with u.fl this time so I need to branch off the main microstrip but I'm not sure what the do's and dont's are. Been searching all morning and I just find general info like RF doesn't like sharp corners etc, but I can't...
I don't have much experience with RF layout considerations regarding trace routing and anything that may affect performance (such as type of trace bends or extra pads in the output RF trace) so I am looking for suggestions on a specific question.
If I have an output 50 ohm microstrip line trace...
voltage drop across a fuse
I was trying to measure the DC current of a circuit by inserting a DMM in series with the positive 3.3v supply terminal so that the circuit's positive supply was being fed from the DMM lead instead of the bench power supply.
I noticed the voltage was only 2.9 volts...
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