Frequency Sweep using HMC834LP6GE

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".

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  • 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!

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  • 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!

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