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Is there any micro-controller with ADC more than 20msps (at least 20msps ) ??
Maximum limit I have found is 12.5msps in texsas instruments C2000 f28335
http://www.ti.com/tool/tmdsdock28335#descriptionArea http://www.ti.com/product/tms320f28335
If not , is there any method to mix more than one channel (ADC) to get higher sampling rate ?
As said by pjc50, typical maximum is around 1 MSPS. But there is some MCU that goes a little higher :
STM32F302 series : 2 ADC with max 5.14 MSPS @ 12 bits (each) / 9 MSPS @ 6 bits. And it seems to have an interleave mode between the two ADC to have higher MSPS. http://www.st.com/web/en/catalog/mmc/FM141/FM141/SC1169/SS1576/LN1824/PF253739
NXP LPC4370 goes up to 80 MSPS @ 12 bits : http://www.nxp.com/products/microcontrollers/cortex_m4/LPC4370FET100.html
It seems that NXP had some high speed ADC so check out NXP site to find others MCU. Also check the datasheets, I'm more digital than analog EE.
Edit: these are rare but other answers have found them. I'm leaving the paragraphs that describe potential reasons to choose the two-chip solution other than availability.
At 20MSPS the analog board design becomes more of an issue than usual. You don't want transient noise leaking from the processor into the signal you're sampling via the power and ground rails. It's advantageous to have them in separate packages.
You need a substantial high-speed processor to handle the data and more external RAM to put the results in. So the usual solution here is a high-speed DSP chip with an external ADC.
