Mar 16, 2009 #1 J John_li Full Member level 5 Joined Aug 6, 2005 Messages 272 Helped 9 Reputation 18 Reaction score 1 Trophy points 1,298 Activity points 2,945 Hi friends, The attached is for 900MHz receiver balun circuit. I know balun need to 180 degree phase difference between two balance output ports. And anyone can tell me why add L3? Has it advantage? Thanks, [size=2][color=#999999]Added after 7 minutes:[/color][/size] [url=https://obrazki.elektroda.pl/47_1237196202.jpg][img]https://obrazki.elektroda.pl/47_1237196202_thumb.jpg
Hi friends, The attached is for 900MHz receiver balun circuit. I know balun need to 180 degree phase difference between two balance output ports. And anyone can tell me why add L3? Has it advantage? Thanks, [size=2][color=#999999]Added after 7 minutes:[/color][/size] [url=https://obrazki.elektroda.pl/47_1237196202.jpg][img]https://obrazki.elektroda.pl/47_1237196202_thumb.jpg
Mar 16, 2009 #2 V vfone Advanced Member level 6 Joined Oct 10, 2001 Messages 5,711 Helped 1,616 Reputation 3,237 Reaction score 1,249 Trophy points 1,393 Activity points 36,276 Re: What is the advantage adding the inductor in balun circu The inductor in front of the differential LNA will improve the common mode rejection and also to reduce the second-order distortions.
Re: What is the advantage adding the inductor in balun circu The inductor in front of the differential LNA will improve the common mode rejection and also to reduce the second-order distortions.
Mar 16, 2009 #3 J John_li Full Member level 5 Joined Aug 6, 2005 Messages 272 Helped 9 Reputation 18 Reaction score 1 Trophy points 1,298 Activity points 2,945 Thanks,vfone,can you expain them or share me some documents about two cases in detail ?And how to select the inductor value? Thanks
Thanks,vfone,can you expain them or share me some documents about two cases in detail ?And how to select the inductor value? Thanks
Mar 16, 2009 #4 D DDavid Full Member level 5 Joined Apr 6, 2006 Messages 305 Helped 49 Reputation 98 Reaction score 27 Trophy points 1,308 Activity points 2,986 Re: What is the advantage adding the inductor in balun circu A few Ω will increase (improve) common mode - inductor have a few Ω. When your worked with diff mode by default you IM2 very good
Re: What is the advantage adding the inductor in balun circu A few Ω will increase (improve) common mode - inductor have a few Ω. When your worked with diff mode by default you IM2 very good
Mar 16, 2009 #5 J John_li Full Member level 5 Joined Aug 6, 2005 Messages 272 Helped 9 Reputation 18 Reaction score 1 Trophy points 1,298 Activity points 2,945 Thanks,DDavid.Any documents introduce differential mode reducing IM2?
Mar 17, 2009 #6 J John_li Full Member level 5 Joined Aug 6, 2005 Messages 272 Helped 9 Reputation 18 Reaction score 1 Trophy points 1,298 Activity points 2,945 [No message]