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rats
Joined: 13 Sep 2004
Posts: 8
Location: Denmark
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 19 Sep 2004 1:09 How to measure NF of LA? Need Help again. |
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I design limiting Amp, just at simulaton level. It is 10Gb/s LA. gain is 47dB.
1.I have not design input buffer and output buffer. using ST 0.13 process
2.How can I measure the NF in cadence?
3Is there any NF difference between the LA core only and with inan dout put buffer? I need help.
As I knew , I shall remove input source, put a port intead. Then in pssI shall choose beating Freq, shall 5GHz? About freq sweep range, what I shall choose? About sweep type? I also don't know what I shall do. Please help me
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 19 Sep 2004 1:22 Re: How to measure NF of LA? Need Help again. |
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I do not know for cadence but is this an RF question based on your figures posted in analog forum.
I know you want a limiting amp but this is treated under the Low Noise Amplifier Dersign section of any RF book.
See if any book in RF covers cadence and I think cadence must have some documents for this purpose. If you change your mind to do things in ADS or Ansoft Designer I will be gladly to help.
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rats
Joined: 13 Sep 2004
Posts: 8
Location: Denmark
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| 19 Sep 2004 2:09 Re: How to measure NF of LA? Need Help again. |
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| What I did is not LNA, this LA NF shall be higher than 16dB, it is for optical application, actually the NF is not so important for LA, of course I still want to know how noisey it is . because TIA decide most of NF for optical reciver block, but I don't know does input matching and output buffer influence the NF.
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nxing
Joined: 10 May 2004
Posts: 446
Helped: 12
Location: China
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| 19 Sep 2004 15:12 How to measure NF of LA? Need Help again. |
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check help document from Cadence (in the chapter or SpectreRF), you will find the LNA simulation example.
Good Luck!
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