Does anyone know if it's possible to generate a frequency sweep from HMC834LP6GE? Unfortunately, unlike some of the other PLLs, it's evaluation board GUI doesn't allow "Scan VCO frequency" or "Frequency Hop".
With in the mentioned Bands ie, 45 - 1050, 1400 - 2100, 2800 - 4200, 5600 - 8400 MHz Sweep is possible. By changing the RF Path "N" Divider it is possible to sweep the frequency.
Thanks for the reply. Any ideas on how to do it automatically using the evaluation board? Also, any pointers on how fast it could sweep the upper part (5600 - 8400 MHz)?
I'm attaching the eval board GUI for the HMC834LP6GE for reference.
You are using the evaluation software of version 188.8.131.52. in this version frequency hop option is not available.
But in version 184.108.40.206 frequency hop is there you try to get the older version for your validation
Are you sure 220.127.116.11 allows frequency hopping for the HMC834LP6GE? The screen capture you sent is when the evaluation software is loaded for HMC820LP6CE. When I try to use 18.104.22.168 for that same part, I also get "Frequency Hop" as an option (I'm attaching a screenshot for reference). However, when the eval software is loaded for HMC834LP6GE, I don't get "Frequency Hop" as an option.
Also, it seems like "Frequency Hop" only allows jumping between frequencies, but it's unclear whether it sweeps linearly between them. Any idea if that is true?
Thanks a lot!
Once You try like this it may work ( not sure).
1. Check weather your PLL (HMC834 ) is detected by the software when you load for some other PLL which has frequency hope option. if it is detected it will show the lock status as " Unlocked" or "Locked" ). I checked the same by loading the software for HMC829 and connected HMC830 it was detected by the software.
2. If your PLL is detected the load the register file for HMC834 then try for the frequency hoping.
Please reply me back what you are getting.
Thanks a lot. So, at a high level, this does work: I first load HMC834 into the evaluation software and get it to lock by loading its register file. Then, I close the evaluation software and open it again, but this time using HMC820 settings (the lock status remains "Locked" and green). Then, I load the register file of HMC834, and it allows me to Scan VCO frequency.
However, I still have two problems:
1- The most important problem is that the scanning is very slow and it takes place only once. We would like to continuously and quickly (i.e. within ~5millseconds) sweep the entire band of interest (5600-7500MHz). However, "Frequency Hop" only allows switching between 2 specific frequencies (with no guarantees that a linear sweep is going to happen as it switches between them). On the other hand, "Scan VCO Frequency" is too slow, and takes few seconds to scan the entire band of interest (as opposed to few milliseconds). Any idea on how we could speed this up in the evaluation software? If that's not possible using the evaluation software, would it be possible using this chip at all (i.e., assuming we program our own microcontroller to control it)?
2- Unfortunately, the Scan VCO range scans only the middle range (i.e., 2669.73 - 4273.05 MHz). We would like to use the upper band of this PLL (i.e., 5600-7500MHz). However, if we start by loading HMC820 software, it doesn't allow us to scan that range or even just set "OUT frequency desired" to anything in it. Any ideas on how to solve that?
Thanks so much again!
1. Sweep / Scanning time of frequency is also calls for the frequency switching time and number of points is also a matter. We used HMC830LP6GE and we achieved minimum frequency switching time (FST) of 60uS including our processing time. So your sweep time = FST * Number of points. And loop filter will also place a roll in the frequency switching time. Measure the frequency switching time and estimate the minimum sweep time.
2. load the software for the PLL which will support your range.
Retrieving data ...