Jan 16, 2008 #1 P passerby Member level 3 Joined Jun 12, 2006 Messages 58 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,694 LNA stages For the RF font-end design, you can use 1-stage LNA or 2-stage LNA. A. Filter --> LNA B. Filter --> LNA --> Filter --> LNA What's the advantage & disadvantage between A & B from technical point of view. Such as NF, gain, interference surppression.... Any good document ?? Thanks.
LNA stages For the RF font-end design, you can use 1-stage LNA or 2-stage LNA. A. Filter --> LNA B. Filter --> LNA --> Filter --> LNA What's the advantage & disadvantage between A & B from technical point of view. Such as NF, gain, interference surppression.... Any good document ?? Thanks.
Jan 16, 2008 #2 V vfone Advanced Member level 6 Joined Oct 10, 2001 Messages 5,709 Helped 1,616 Reputation 3,237 Reaction score 1,248 Trophy points 1,393 Activity points 36,250 Re: LNA stages First option due to lower Gain have better intremodulation behavior. Second option has higher Noise Figure, but higher Gain. The most important contributor to the system NF is the first stage. The Insertion Loss of the first filter it will add dB by dB to the total system NF. Using two filters improves the out of band interference.
Re: LNA stages First option due to lower Gain have better intremodulation behavior. Second option has higher Noise Figure, but higher Gain. The most important contributor to the system NF is the first stage. The Insertion Loss of the first filter it will add dB by dB to the total system NF. Using two filters improves the out of band interference.
Jan 18, 2008 #3 P passerby Member level 3 Joined Jun 12, 2006 Messages 58 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 1,694 Re: LNA stages Is there any article analyzing these two topologies? Thanks.
Jan 24, 2008 #4 S shogun Member level 1 Joined Feb 4, 2003 Messages 36 Helped 3 Reputation 6 Reaction score 2 Trophy points 1,288 Location Forests of Japan Activity points 309 Re: LNA stages To find out more on this subject, you should look at the book called "Communications Receivers" by Rohde Shogun
Re: LNA stages To find out more on this subject, you should look at the book called "Communications Receivers" by Rohde Shogun
Feb 5, 2008 #5 B bharat_gill Newbie level 2 Joined Feb 4, 2008 Messages 2 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,290 Re: LNA stages You can try to simulate the two circuits and see the advantages and disadvantages of each parameter important to your design...you can get simulators like ansoft, microwave office for trail if you dont have access to one...
Re: LNA stages You can try to simulate the two circuits and see the advantages and disadvantages of each parameter important to your design...you can get simulators like ansoft, microwave office for trail if you dont have access to one...
Feb 5, 2008 #6 dingjingfeng Full Member level 3 Joined Aug 12, 2005 Messages 189 Helped 17 Reputation 34 Reaction score 8 Trophy points 1,298 Activity points 2,243 LNA stages A small area(simple structure, simple application etc) B for better perfornmance Larger area(usually),
LNA stages A small area(simple structure, simple application etc) B for better perfornmance Larger area(usually),