LTC5577 Performance with 40-80MHz IF

The LTC5577 IF gain seems to have a lot of ripple, looking at the datasheet figure 11.

What is the expected ripple and gain when using a 40-80MHz IF (with, say RF: 1500-4500MHz)?

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    •  Analog Employees 
    on Jul 8, 2019 9:57 PM

    The ripple is not bad at all. What is your requirement?

    Looking at datasheet plot G03, I would say Gc slopes down from 0.7dB at 1500MHz to 0dB at 4300MHz. That is only 0.7dB tilt across almost 3GHz. The periodic ripple is likely due to measurement system. Even that is only about +/-0.2dB.

    Figure 11 is a sweep across IF frequencies. The transformer loss is included in the plot. The ripple from 40MHz to 80MHz looks to be +/-0.2dB.

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  • 0
    •  Analog Employees 
    on Jul 8, 2019 9:57 PM

    The ripple is not bad at all. What is your requirement?

    Looking at datasheet plot G03, I would say Gc slopes down from 0.7dB at 1500MHz to 0dB at 4300MHz. That is only 0.7dB tilt across almost 3GHz. The periodic ripple is likely due to measurement system. Even that is only about +/-0.2dB.

    Figure 11 is a sweep across IF frequencies. The transformer loss is included in the plot. The ripple from 40MHz to 80MHz looks to be +/-0.2dB.

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