Using HMC247/877 at 3GHz ?

Hi, I am looking for an analog phase shifter on 3GHz, and I see ADI has two analog phase shifter IC HMC247 and 877.  But the listed lower frequency limit is 5GHz for one and 8GHz for the other.  My question is if I could use the devices on 3GHz at all ?    I don't care if the phase shift range gets reduced at 3GHz, as long as the rf gets through without too much loss, and the phase control still has some effect.  Thanks  - H.

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  • Hi hma,

    Regarding the HMC247, we have S-parameter data only as low as 4 GHz, so I don't have the data with which to answer your question regarding 3 GHz operation. Regarding the HMC877, I'll need to look at the data set we have and review its data sheet to better understand its operation before I can comment.

    Do you care about absolute phase shift or do you just need to be able to modulate the phase such that you achieve a certain relative phase change? If you just need to modulate the phase then I wonder if the HMC631LP3E Vector Modulator 1.8-2.7 GHz (a packaged part, not a die) would do what you need. It allows analog control of both gain and phase, so you would need to apply I and Q analog control signals of the proper values for holding the gain constant while shifting the phase by the desired amount. The part would give you gain in positive dB, rather loss like the HMC247. For the HMC631 we have 1.0-3.0 GHz S-parameter data (in .mdif format) from which the 3.0 GHz performance could be seen. 

    Let me know if your preference is for die or packaged part and if using a vector modulator to achieve a relative phase shift is an acceptable option.

    Regards,

    SMcBride   

Reply
  • Hi hma,

    Regarding the HMC247, we have S-parameter data only as low as 4 GHz, so I don't have the data with which to answer your question regarding 3 GHz operation. Regarding the HMC877, I'll need to look at the data set we have and review its data sheet to better understand its operation before I can comment.

    Do you care about absolute phase shift or do you just need to be able to modulate the phase such that you achieve a certain relative phase change? If you just need to modulate the phase then I wonder if the HMC631LP3E Vector Modulator 1.8-2.7 GHz (a packaged part, not a die) would do what you need. It allows analog control of both gain and phase, so you would need to apply I and Q analog control signals of the proper values for holding the gain constant while shifting the phase by the desired amount. The part would give you gain in positive dB, rather loss like the HMC247. For the HMC631 we have 1.0-3.0 GHz S-parameter data (in .mdif format) from which the 3.0 GHz performance could be seen. 

    Let me know if your preference is for die or packaged part and if using a vector modulator to achieve a relative phase shift is an acceptable option.

    Regards,

    SMcBride   

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