I am looking for a power detector that could detect 5-10ns pulses of RF energy (400MHz-1.5GHz range). Would a Schottky diode be the best option, based on your presentation? However, I do need it to be able to detect -50dBm
On behalf of Michiel Kouwenhoven:This is a challenging problem. In general there are two options:
1) Use a Schottky detector preceded by an LNA; the LNA needs to have 25-30dB of gain and sufficiently fast response to gain up the Schottky detector input signal to -25dBm or above. The Schottky devices that ADI offers provide around 10ns rise/fall time (ADL6010, LTC5564). Both do not entirely reach down to 400MHz, though. later this year we will release the ADL6012 (see analog.com) that does have around 2ns rise/fall time but needs a -10dBm input signal, i.e. more LNA gain at the input.2) LOG detector like AD8317, which has rise/fall times of 10/6ns. Propagation delay, though is probably in the 100ns range. It can detect down to -50dBm (or lower).
3) An SDLVA: HMC613 has 4ns rise/18ns fall time and is able to detect close to -50dBm. HMC1013 has better sensitivity, but is spec’ed down to 500MHz, not 400MHz. It might still be useful. Both of these are suitable for high-value, high-performance solutions, and not very suited for low-cost applications.