imett
Junior Member level 1
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Hello,
I try to explain my problem: i've to convert a RF impulse ,width about 1us or less with frequency up to 1GHz or 2GHz into a baseband impulse viewable with my scope (100MHz).
My first idea was to use a not biased schottky detector and two mmic with +40dB of amplification with very simple design, but the sensivity ( the lowest signal measured with the scope 2mV/DIV) was about -45dBm.
The second step was a biased detector but the sensivity was about -50dBm
Then the last step is use an opamp to convert the high impedance of the detector (10K) to a 50ohm but the sensivity increase at -70dBm.
Can anyone give me some suggestion to increase the sensivity? There is a way to use an active detector instead a passive detector, i've tried with a precision rectifier but it work up to 500MHz.
thanks in advance.
I try to explain my problem: i've to convert a RF impulse ,width about 1us or less with frequency up to 1GHz or 2GHz into a baseband impulse viewable with my scope (100MHz).
My first idea was to use a not biased schottky detector and two mmic with +40dB of amplification with very simple design, but the sensivity ( the lowest signal measured with the scope 2mV/DIV) was about -45dBm.
The second step was a biased detector but the sensivity was about -50dBm
Then the last step is use an opamp to convert the high impedance of the detector (10K) to a 50ohm but the sensivity increase at -70dBm.
Can anyone give me some suggestion to increase the sensivity? There is a way to use an active detector instead a passive detector, i've tried with a precision rectifier but it work up to 500MHz.
thanks in advance.