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Why do we use SFDR instead of using P-1db point?

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yorande

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As I see in books and tech notes, SFDR is not often used and seems mainly for ADC and DAC. Why do people use SFDR instead of P-1db point there?
Thanks!
 

Re: Why do we need SFDR?

yorande said:
As I see in books and tech notes, SFDR is not often used and seems mainly for ADC and DAC. Why do people use SFDR instead of P-1db point there?
Thanks!
Click to expand...

linear dynamic range, which use 1-db gain compression point for the upper side, is used for PA; SFDR is used for LNA and Mixer et al.
 

Re: Why do we need SFDR?

Oh, it's quite contrary from what I read in papers.
In IEEE papers about lna and mixer, seldom do they mention SFDR.
(As I remmeber, no more than 2.)
When I search SFDR in google, I see ADCs have their SFDR performance..
Of course, seems not seperate products for LNA or mixer.
 

Why do we need SFDR?

I saw only SFDR for ADCs. In ADC specification, it seems that SFDR is very important parameter but I dont know why?
 

Re: Why do we need SFDR?

Hi

SDFR has its importance in Direct digital Synthesizers, ADCs and Analog Synthesizers but it has still meaning in LNAs, mixers and ...
Importance of the SFDR depends on you application and the device which it has measured for.
For example in an ADC SFDR and SNR determine sensitivity of the ADC and in an DDS it determines the spectral purity of the DDS.

Regards
 

Re: Why do we need SFDR?

P1dB point tells you how a device goes totally non-linear due to a large signal.

SFDR tells you how a device goes a little non-linear due to a small signal (like in a receiver).

They are related somewhat, but only to a first order.
 

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