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Sorry, I didn't get how to float the earth pin!
I have tried to connect the earth of the power supply and the scope, and that has reduced the noise a little bit
I am not using any type of modulation. It is only a bunch of amplifiers and an IQ mixer for up and down conversion.
Will using a LISN...
Right. Sorry for the delay in response as I was waiting to loan an SMPS.
Here is a phase noise measurement using linear PS and SMPS
The setup was the following: The power supply is parallel connected to the DUT amplifier + DC electronic load to run it nearly at the maximum available full load...
Yes, I have a SignalHound that is able to measure the phase noise.
Unfortunately, I am still waiting to receive the switch-mode power supply as the lead time is a little bit long.
Once I have it, I will post the phase noise results here to get you advice.
I'm thinking of adding a filtering capacitor as the last solution.
So, depending on your comment, the only way is to capture our fundamental tone of the PA response experimentally before and after adding the new power supply and see if there is any change! Is that true?
Should the ripple's frequency range between 60 to 120Hz?
The LNA frequency range is between 0.1-500MHz, while the band of interest is something around 100-450MHz. Here I can understand the ripple's frequency may upset the LNA biasing point!
The PA frequency range is between 700-18000Mhz, while...
Hi Klaus,
Thank you for your reply.
Usually, the PA manufacturers don't reveal the PSRR. Also, I would think of having filtration at the output of the PSU as a last option.
That's true that it's frequency dependant. One of them will be between (100MHz to 450MHz) and the other a bit wider (4GHz...
Hello all,
I was using a bench power supply with 1mV of ripples to power up some RF power amplifiers/ LNAs.
If I used a different power supply with nearly 100mV of ripples, will that affect the PA/LNA performance? How to know at what level the PA/LNA's response will be affected? Does the phase...
This is what I am planning to do, but I was thinking that if I use a multichannel signal generator to generate two CW one at 90 degrees and the other at 0 would do the job, but it seems the CW signals don't have the same trigger, therefore every time I/Q turned off and on it changes the phase...
Good morning gents
I am trying to test the rejection and conversion loss of "HMC1056LP4BE" IQ mixer (https://www.analog.com/media/en/technical-documentation/data-sheets/hmc1056.pdf).
I set the LO to be +10dBm @8.5GHz, , IF1: -10dBm @250MHz, IF2: -10dBm @250MHz - Here I am using 3 different...
Hello all,
We are selling S-band HPA for Satcom applications
Customer need to obtain key RF characteristics of S-Band HPA, specifically Wideband frequency response of carriers as a function of output level to understand Out Of Band energy levels.
They gave the following example, but I am not...
I am reading Modern Communication Circuits (2nd edition) - Jack R.Smith
Thanks for that, but I haven't found an example of designing Class C PA
I have chosen theta=90, so I got the below values (please let me know if there's any concern about these values)
I1=20 mA
Ropt=275 Ohms
Po=55 mW
Ip=40...
Thanks BradtheRad,
In order to find the optimal value for tank circuit component, I have to calculate the Q factor first which can be calculated as Q=Fc/BW
Next, the source and load resistance are combined to determine the total parallel resistance of the circuit using Rp= Zs.Zl/Zs+Zl
After that...
The impeadance presented at the base of the transistor is 7.695-j598.838, please correct my if I am wrong (screenshots attached)
You this could be done by experiment!?
I have modified the value depends on f=1/2pi*sqrL.C to 25pF/1nH
Sorry I don't understand this exacty
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