The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> flicker noise of the down mixer https://designers-guide.org/forum/YaBB.pl?num=1162208284 Message started by sivacha on Oct 30th, 2006, 3:38am |
Title: flicker noise of the down mixer Post by sivacha on Oct 30th, 2006, 3:38am hi while designing the down mixer(active, folded mixer), iam facing a serious and well known difficulty with the flicker noise of the input switches. Gain, noise figure and linearity are conflicting with each other. Gain increases----> noise figure improved ------> linearity is lost. Could you please suggest the good optimization for these?? Receiver:: Low IF type Freq range of operation:: 2.4GHz thank you... |
Title: Re: flicker noise of the down mixer Post by aaron_do on Oct 30th, 2006, 8:45pm How low is your IF? If it is above 1 MHz you should be able to avoid the flicker noise problem. Gain NF and Linearity always conflict. I suggest you optimize based on your receiver requirements (i.e. for what purpose?). You will need some idea of all the other stages performance also (channel select filter, VGA etc) Aaron |
Title: Re: flicker noise of the down mixer Post by sivacha on Oct 30th, 2006, 9:48pm aaron_do, my IF is 1MHz. this receiver is for BT2.0 Enhanced Data Rates. my main concern is the flicker noise of the LO switches. |
Title: Re: flicker noise of the down mixer Post by aaron_do on Oct 31st, 2006, 4:50am I don't really know anything about your system of the bluetooth 2.0 specs. I asked a question previously about system NF calculation and found this paper very helpful. Its posted in the link: http://www.designers-guide.org/Forum/YaBB.pl?num=1157358393 based on your system specs you can estimate the required gain, NF and linearity. hope it helps, Aaron |
The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |