How to measure SFDR for 14 bits ADC

• May 19, 2005

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yen

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I am doing 14 bits dac.
How do i measure SFDR?
If you know, can you tell me detail?
You can suggest me to read what kind of book or paper ?
Thank you.

 

• May 20, 2005

• #2

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Wenye

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Re: SFDR

You may need a high performance Spectrum analyzer.

 

• May 20, 2005

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yen

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Re: SFDR

I want to use matlab to simulate.
How do i do?
Thank you.

 

• May 20, 2005

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yibinhsieh

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Re: SFDR

Matlab is just the behavioral modeling. I don't think it can simulate the SFDR.

Maybe you should simulate the SFDR in HSPICE.

Yibin.

 

• May 20, 2005

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yen

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Re: SFDR

If i use hspice, how to do ?
Can you tell me detail.
Because i do this first.
Thank you.

 

• May 23, 2005

• #6

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Btrend

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Re: SFDR

yen said:

If i use hspice, how to do ?
Can you tell me detail.
Because i do this first.
Thank you.

Click to expand...

please check the related topic in this board, such as
"f I want to simulate the SFDR of a 8bit DAC"
or use search SFDR in this board, u will find many useful documents.

 

• May 24, 2005

• #7

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noiseless

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Re: SFDR

Actually, you first need to do the fft of the output. Then calculate the SFDR, that is the ratio of the signal and TOTAL sum of the noise.

 

• May 24, 2005

• #8

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Analog_starter

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Re: SFDR

Hi noiseless,

You mean it is SNR, right?
SFDR = signal power / largest spurious power

Best Regards
Analog_starter

 

• May 29, 2005

• #9

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yen

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Re: SFDR

I want to simulate SFDR.I have a thought.I use hspice.
My inputs are digital signals and let output is a sine wave.
Then I do fft.I don't know that this idea is correct or incorrect.
Please tell me.My output is a sine wave and how do i do about my input.
Maybe you have a good thought ,and please tell me or teach me.

 

• Jun 1, 2005

• #10

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SFDR

I think the idea you have is correct.
You can get the input you want by using Verilog-A .

 

• Jun 1, 2005

• #11

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yen

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Re: SFDR

Dear zhhzl,
I don't know what is Verilog-A. Can you tell me detail.
How do I do? Can you suppose me reference information.
Thank you.

 

• Jun 1, 2005

• #12

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SFDR

you can extract the signals bu logic anlyzer, then use the sample point as input to MATLAB. it is easy to find a MATLAB script for checking SFDR on the web.

Good luck!

 

• Jun 2, 2005

• #13

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Re: SFDR

I know my output can be analyzed by matlab.
But I don't know produce my inputs.
I have 14 bits.
If my sine wave is 1KHz,what is my inputs of 14 bits?
Thanks.

 

• Jun 2, 2005

• #14

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Re: SFDR

The input depend on update speed of ur dac.