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https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> lo-rf isolation units https://designers-guide.org/forum/YaBB.pl?num=1161916508 Message started by sivacha on Oct 26th, 2006, 7:35pm |
Title: lo-rf isolation units Post by sivacha on Oct 26th, 2006, 7:35pm hi i got a basic doubt regarding the units of lo-rf isolation. in the specs for lo-rf isolation it is said that XX dBVrms. is it same as dB?? otherwise how to convert it into dBVrms?? Thanks a lot............ |
Title: Re: lo-rf isolation units Post by ACWWong on Oct 27th, 2006, 2:11am dBVrms is dB in reference to 1 Vrms. so if I have 1V amplitude sine wave signal (ie 1*cos(wt)), then Vrms=1/sqrt(2)=0.707=-3dBVrms lo-rf isolation is measured in straight dB (a unitless ratio) NOT dBVrms. so if 1% of the LO voltage signal leaks to the RF port then one can say the LO to RF isolation is 40dB. |
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