# HMC394 Output Power Levels

Hello,

I am having some trouble understanding the output power levels for the HMC394. For example, let's say that I have an input frequency of 1 GHz and a division ratio of N = 8. Would I expect to have around –23 dBm output on the fundamental feedthru power of 125 MHz?

My confusion here is that I do not understand what is meant by "Fundamental Feedthru Power." Does this refer to the input fundamental frequency (in this example 1 GHz)? Or does this refer to the output fundamental frequency (125 MHz)? I find it a bit odd that the 2nd harmonic ouput power would be greater than the fundamental if it refers to the output frequency.

This output power is important for my application because I intend to use a LPF to capture the first harmonic and end up with a sinewave. Depending on the output power in this configuration, I may need to include an amplifier.

Thank You,

E.S.

## Top Replies

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• Hi E.S.

In your example of 1GHz input with a /8 divide setting producing a 125MHz output, the input fundamental feedthrough power refers to the level of the 1GHz input frequency seen on the output.  In this example your 125MHz output signal will include a -23dBm output tone at 1GHz (input fundamental feedthru to output), based on this plot. The 125MHz output fundamental power would be around -5dBm according to this plots Hope this helps!

• Hi E.S.

In your example of 1GHz input with a /8 divide setting producing a 125MHz output, the input fundamental feedthrough power refers to the level of the 1GHz input frequency seen on the output.  In this example your 125MHz output signal will include a -23dBm output tone at 1GHz (input fundamental feedthru to output), based on this plot. The 125MHz output fundamental power would be around -5dBm according to this plots Hope this helps!

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