multi-channel ADC design architecture

• Dec 12, 2004

• #1

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qslazio

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a multi-channel adc analog mux

i'm going to design a multi-channel ADC design ,which architecture should i choose? (SAR ,sigma-delta,pipeline)?

The key parameter is 200MSBP and 8~9bit
thanks

 

• Dec 12, 2004

• #2

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CDRCDR

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I think pipeline architecture is much better and easier to implement at such speed.But coupling between different channels should be considered as well.

 

• Dec 12, 2004

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bastos4321

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You should use pipeline or folding.

Bastos

 

• Dec 13, 2004

• #4

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extraord

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i think both pipeline and folding are qualified for this.
but if it is 200MSBP , is sigma-delta practical under 0.18tech?

 

• Dec 13, 2004

• #5

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bastos4321

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extraord said:

i think both pipeline and folding are qualified for this.
but if it is 200MSBP , is sigma-delta practical under 0.18tech?

Click to expand...

Sigma delta is not practical due to the high clock frequency that is needed. Only pipeline or folding.

Bastos

 

• Dec 14, 2004

• #6

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james_su

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SAR ,sigma-delta,pipeline are just accroding your spec about speed power bits

 

• Dec 14, 2004

• #7

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colonel

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consider you device speed,and process .the folding is ok.

 

• Dec 14, 2004

• #8

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icsrc

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traditional sigma-delta converter is not suit for multichannel application because of its latency between input and output

 

• Dec 17, 2004

• #9

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yeewong_su

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200M 8 ~9bit

You should choice the pipeline ADC

 

• Dec 21, 2004

• #10

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amraldo

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there is 11 channel adc achieved by maxim
it used sar
if u r going to use a multiplexer try to implement it as a break before make mux

 

• Dec 22, 2004

• #11

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segabird

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According to your spec 200Mhz 8~9bit,
I think fold or pipeline are the choise and the others are not suitable.

 

• Apr 12, 2005

• #12

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sunny153

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pipeline or parallel pipeline architecture is suitable for your specs as 8~9 bits 200 mbps,

 

• Apr 12, 2005

• #13

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Vamsi Mocherla

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May be this attachment helps you. I would suggest pipelined architecture. I do not think that Sigma delta can work for your needs. I am expecting that the signal frequency is atleast 5-10 MHz(Is it Video?)

 

• Apr 17, 2005

• #14

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cxm

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Maybe the following paper can help you

Noise, Speed, and Power Trade-offs in Pipelined Analog to Digital
Converters
by
David William Cline