Need to measure phase difference between two 130 MHz (@-20 dBm to 0 dBm) pulsed signals (min PW 50ns). whats he best ADC or chip i can use ??
Sounds like you're looking for a dual channel ADC capable of simultaneously digitizing two phase-independent Analog Input signals? To insure consistent capture of your minimum 50ns pulse width input you will need to sample at least 2x this minimum PW, or every 25ns, preferably even faster. A 40Msps ADC will be the minimum Encode requirement but I'd probably go higher to increase the # of sampling points(intervals) per pulse.
Depending on the dynamic range you require, the pin-compatible dual channel AD9269(16b), AD9251(14b), AD9231(12b), or AD9204(10b) are all avail in 20Msps to 80Msps speed grades.
Our dual channel ADC's do not have the ability to directly measure the phase difference between the inputs but you can take advantage of the fact the simultaneously sampled inputs propagate through the ADC core with the same phase matched latency. You will need to capture and compare the independent ADC channel output streams within an FPGA or other processing interface in order to determine the phase delta between the two ADC channels.
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