How can I resolve the issue of constant output voltage of 1.4V when measuring RF signals at 5.8 GHz with LT5581? My input power ranging from 5 dBm to 10 dBm?

Question

How can I resolve the issue of constant output voltage of 1.4V  when measuring RF signals at 5.8 GHz with LT5581? My input power ranging from 5 dBm to 10 dBm?

Accepted Answer

To solve the issue of constant output voltage when measuring RF signals at 5.8 GHz with input power ranging from 5 dBm to 10 dBm using the LT5581 detector, place an RF attenuator, such as a 20 dB attenuator, in front of the input. This will ensure that the input to the detector is in the range of -15 dBm to -10 dBm, which is within the optimal operating range of the LT5581.

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LT5581: FAQ