Hi all,

The question is related to noise figure of RF/IF gain amplifiers, and can be formulated in different variants.

1.a What was the signal level used to measure the noise figure of ADL5536 or ADL5602?

1.b If I provide a 0dBm signal with a noise level of -174dBc, what the output power/noise level would be?

1.b.1 what if the signal is +5dBm with -179dBc?

1.b.2 signal with -5dBm, -169dBc?

1.c. What is the residual noise of these amplifiers (providing a theoretical signal with -300dBc noise)?

The second question is:

2. What is the flicker corner of these amplifiers provided with a 0dBm signal?

Any help appreciated.

Regards,

Dorin

I would suggest thinking about it a bit differently. Start with the equation.

Noise Spectral Density (dBm/Hz) = -173.8 dBm/Hz + Gain(dB) + Noise Figure(dB)

So an amplifier with a noise figure of 10 dB and a gain of 10 dB will have an output noise floor of -153.8 dBm/Hz. If you output signal level is 0 dBm then the noise spectral density in dBc/Hz is -153.8 dBc/Hz.

We generally don't characterize flicker noise since these devices are generally ac-coupled at a high-pass corner frequency that is well above the 1/f corner. If they do have flicker noise it will be independent of whatever signal is present.