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Priya
Joined: 13 Dec 2003
Posts: 8
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 16 Dec 2003 14:25 Resolution.... |
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Hi,
I need some suggestions on improving the resolution of ADC by software processing.
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C-Man
Joined: 19 Jul 2001
Posts: 1235
Helped: 73
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16 Dec 2003 17:25 Re: Resolution.... |
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I often use some kind of software filter to improve the jitter but you can not get more resolution than your AD Converter has physicaly 
You can for example sum the last 4, 8, 16, 32 ... samples and build an average (will only work for "slow" signals).
It is very important to carefully design the PCB for an application which has to get a "high" resolution analog value via an ADC. You can for example guard the whole analog section of your board by a single trace which is connected to analog ground at a single point (this is called guarding). Also use only one a single analog GNd point as your reference.
hope this helps
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ME
Joined: 14 Mar 2002
Posts: 1523
Helped: 13
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| 16 Dec 2003 17:37 |
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Here are some good lessons about ADC's:
http://www.national.com/analogu/adc/101/lesson1.html
http://www.national.com/analogu/adc/101/lesson2.html
In lesson #2 you can read about how to improve your Mixed-signal PCB layout
Controlling Noise and Radiation in Mixed-Signal and Digital Systems: http://www.national.com/appinfo/adc/files/controlling_noise.pdf
It is, in fact, possible to reduce the distortion, and also to
improve the resolution below an LSB (least significant bit),
by adding noise (dither) to the signal of interest.:
http://www.national.com/an/AN/AN-804.pdf
You can find a lot of application notes about this topic from all vendors of ADC's.
Recently i read an application note from Microchip about ADC circuit design and layout.
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