Explanation of LNA parameters: IP3, P1dB and OP3

• Mar 18, 2004

• #1

abdoeng

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what mean by IP3,P1dB ,OP3
THANKS

 

• Mar 18, 2004

• #2

odyseus

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noise parameters of lna

Have a read through my linearity tutorial I think it explains all !

 

• Mar 19, 2004

• #3

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Element_115

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parameter of lna

For LNA's the most important parameters are (Of Course) Low Noise
Figure, and Gain. If you have Low Noise and High Gain this will keep
the whole systems noise close to the LNA's. For Example:

NFt= NF1 + (NF2-1)/G1 + (NF3-1)/(G1*G2) +.....

Now note if G1 is large, NF1 is low and NF2 will not greatly affect the
Systems noise( If you only use 2 Amps, use first 2 terms).

NFt = 2 + (5-1)/12 + (20-1) /(12*3) = 2.86

Remember the noise and gain for this EQ are in linear form, and you must
convert the answer to dB.

Also your systems application will determine what parameters are more important, so there is no perfect answer to this question.

Hope this helps.

 

• Mar 19, 2004

• #4

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djxwolf

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which parameter get affect due to vswr in lna

Generally speaking, such parameters in LNA are not as important as in Power Amplifier.

 

• Mar 19, 2004

• #5

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pva

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lna noise parameters

There is simple practical relation between this parameters IP3(dBm) = P1dB(dBm) + 10dB,OP3(dBm) = IP3(dBm) + Gain(dB).Generally this parameters describe ability of LNA to work with high level signals.

 

• Mar 21, 2004

• #6

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activewei

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what is lna

A paper on Distortion in amplifiers. You can have all the answer and even more...

 

• Mar 31, 2004

• #7

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wjnbry

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lna design parameters

i think you should look up it for some books.
these are all basic questions in books.

 

• Mar 31, 2004

• #8

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chinaing

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low noise amplifier important parameters

You can reaserch google

 

• Mar 31, 2004

• #9

V

v_naren

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parameters of lna

the best book to read from about these parameters would be from
1) RF microelectronics by behzad razavi

and

2) RFIC design by calvin plett

 

• Apr 5, 2004

• #10

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shibshankarsingh

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lna parameters

i have designed 3.1-3.5 ghz lna through .7um mesfet technology. Noise figure is typically .83dB,gain is typically 18dB ,v.s.w.r is better than 1.8:1 at final design level.i want to reduce the noise figure. please give me some solution and comment about design.

 

• Apr 9, 2004

• #11

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eecly

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lna linearity

They are used to measure the LNA linearity.

eecly

 

• May 21, 2004

• #12

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rfic

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ip3 and op3

How to find the book:RFIC design by calvin plett ???

 

• May 21, 2004

• #13

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VSWR

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Re: LNA parameters?

It depends on how far you are from best achievable NF for your process. What is NF opt acc to the manufacturer? Have you designed for NF opt? Or for a tradeoff between S11 and NF?

shibshankarsingh said:

i have designed 3.1-3.5 ghz lna through .7um mesfet technology. Noise figure is typically .83dB,gain is typically 18dB ,v.s.w.r is better than 1.8:1 at final design level.i want to reduce the noise figure. please give me some solution and comment about design.

Click to expand...

 

• May 22, 2004

• #14

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rfic

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LNA parameters?

I could download the book: RFIC design by calvin plett ???

 

• May 22, 2004

• #15

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v_naren

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Re: LNA parameters?

you can get RFIC design by plett from ftp.runnet.ru