Power spectrum problem with dBm/Hz and dBm

Status
Not open for further replies.
J

jackie1116

Junior Member level 2
Joined
Nov 15, 2005
Messages
22
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,447
Power spectrum unit ?

I want to input a -60dBm/Hz power in 4MHz ,but our signal generater can only
input dBm signal ,if i press -60dBm on signal generater, I don't know that is right?
and what is different between dBm/Hz and dBm .

Can anyone tell me !

thank a lot
 

Re: Power spectrum unit ?

To avoid too many explanations just set your Signal Generator modulation for CW and you get dBm/Hz = dBm.
 

Re: Power spectrum unit ?

It is getting harder and harder to figure out what posters are trying to ask. I URGE everyone to write as long and detailed a question as possible. The language barrier is getting fierce

Are you trying to output a single tone? Then the power in dBm/Hz is the same as the power in dBm.

Are you trying to output broadband noise at a -60 dBm/Hz level over a 4 MHz bandwidth? Then you have to modulate your signal generator with a noise source at a modulation input. Your power that would be measured on a CW power meter would be -60 dBm/Hz +10 Log (4 MHz) = -60 +66 = +6 dBm. i.e you would have 1 millionth of a watt in each hertz of bandwidth, times 4 million chunks of 1Hz bandwidth.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…