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High Speed Data Converters
High Speed Data Converters Forum
Building a Network Analyzer, need some suggestions
Hi, I built a network analyzer using a 150MSPS ADC, 275MSPS DAC (both 14 bit) and an altera stratix-III eval board. I generated 2 tones using an NCO on the stratix (cosine and sine), and sent the cosine signal to the DAC who's output went into my DUT from port 1. The return signal, port 2, would then be sent to the ADC which was fed back into the stratix. The stratix then multiplied the NCO generated Cosine and Sine with the received ADC signal to get the I and Q. I did this from 1MHz to 75 MHz and it works really well. The problem is the cost and size. I'd like to get rid of the stratix and use some sort of microcontroller/DSP and possibly use an analog front end instead of the ADC/DAC. Lastly, I need to get the data off of the microcontroller/DSP preferably via wifi.
I'm a VHDL guy so I know relativley little when it comes to DSPs and MCUs and interfacing them with data-converters. Could someone point me in the right direction or give me a few suggestions? Cost is the main deciding factor in this design.
Running at those speeds may be too fast for the I/O interfaces of the DSPs. I do not think it will work at all with an MCU. You may want to check with the DSP forum about this...
As far as an analog front end, I believe the AFE7225 is the closest thing we'll have to something that will work. The ADCs are only 125 MSPS and the DACs are 250 MSPS. Both the ADCs and DACs are only 12-bits as well. Note that there is an NCO on both the recieve and transmit side. Perhaps these could be used instead of the NCO in the FPGA. You'd need to look into the implementation.
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