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Sachin Gupta & Akshay Phatak

ADC Guide, Part 14: Impedance Matching

Sachin Gupta
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Hughston
Hughston
4/3/2013 11:02:01 AM
User Rank
Newbie
Re: Transformer
Transformer coupling is very convenient to use for an ac differential signal in a mixed signal system with multiple grounds. It gives great CMRR between noisy grounds. I think you will be flat enough over your bandwidth with a transformer because because the IF frequency is going to stay within a limited enough range. I am making an assumption with that last sentance.

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Vishal Prajapati
Vishal Prajapati
4/3/2013 5:24:57 AM
User Rank
Master
Re: Difficult to handle the inductance
Sachin/Akshay, Can you suggest some good books or literature for impedence matching? Can we try to simulate this reflection of signal or impedance matching in the PSPICE or similar software?

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amrutah
amrutah
4/2/2013 11:56:30 AM
User Rank
Master
Transformer
"For RF or IF applications, transformer-based matching circuits are more popular."

Usage of the transformer wil  help by isolating the input of the ADC from source but it will make the system bulky.  Only from Impedence matching perspective is transformer used or are there any other advantages?

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amrutah
amrutah
4/2/2013 11:51:41 AM
User Rank
Master
Difficult to handle the inductance
Is using the inductance the only method to match the impedence? The input parasitic capacitance to ground can form a parallel resonant circuit. If the series cap and the parasitic cap are of the same order than the 2 resonant can cause problems...

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More Blogs from Sachin Gupta & Akshay Phatak
In the previous part of this series we looked at differential vs. single-ended drive methods for the ADC. This installment of the series looks at ADC input impedance and the effect it has on accuracy.
In previous part of this series we discussed the noise specifications of an ADC. This installment of the series talks about the ADC input configuration.
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