HMC8410 Low Frequency Response

The HMC8410 and 8410 evaluation board both list that the low-frequency cutoff is 10MHz when biased with the given bias network.  What is the low-end cutoff frequency of the SMT part and of the bare die without the bias network?  If I provide an extremely broadband bias tee (70kHz to 30GHz), what does the amplifier's gain look like in the 70kHz to 10MHz region?

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    •  Analog Employees 
    on Mar 23, 2017 1:58 AM

    Hi AdamK,

    Sorry for the delayed reply. For the HMC8410LP2FE we have measurement data only as low as 10 MHz. That data was taken using the stock evaluation board, which includes the passive components necessary for biasing and bypassing the part while providing, across the entire specified operating range, what we felt to be the ideal trade-offs between the critical performance parameters (i.e., gain, return loss, NF, etc.). Obtaining adequate response at frequencies < 10 MHz might require changing the application circuit's component values, which could have a negative effect on the stability at low frequencies. For that reason I will ask the designer what we could expect.

    FYI, the die version of the part was characterized using coaxial broadband bias tees like what you've described, mounted on the RF probes. I'm not aware of that having a negative effect on the low frequency stability, but the parasitics for the die configuration would be different than for the packaged part. For the case of the die we also measured only as low as 10 MHz.

    Let me see what I can learn from the designer and follow up soon...

    Regards,

    SMcBride 

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  • 0
    •  Analog Employees 
    on Mar 23, 2017 1:58 AM

    Hi AdamK,

    Sorry for the delayed reply. For the HMC8410LP2FE we have measurement data only as low as 10 MHz. That data was taken using the stock evaluation board, which includes the passive components necessary for biasing and bypassing the part while providing, across the entire specified operating range, what we felt to be the ideal trade-offs between the critical performance parameters (i.e., gain, return loss, NF, etc.). Obtaining adequate response at frequencies < 10 MHz might require changing the application circuit's component values, which could have a negative effect on the stability at low frequencies. For that reason I will ask the designer what we could expect.

    FYI, the die version of the part was characterized using coaxial broadband bias tees like what you've described, mounted on the RF probes. I'm not aware of that having a negative effect on the low frequency stability, but the parasitics for the die configuration would be different than for the packaged part. For the case of the die we also measured only as low as 10 MHz.

    Let me see what I can learn from the designer and follow up soon...

    Regards,

    SMcBride 

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