On Tue, Oct 4, 2011 at 6:25 PM, Jeffrey Gregory <jagre...@umich.edu> wrote:
> The B100 looks appealing for an upgrade from my USRP1, but I have some > questions. Since the B100 can accept 10MHz and PPS reference, is it > compatible with the GPSDO module? It can accept 10 MHz and PPS from a GPSDO, but it doesn't have a serial port for position and time info. You will also need to mount it externally. So yes, you can use them together, but with some limitations. > Also, the Spartan 3A-1400 looks to > be roughly twice as big as the cyclone FPGA on the USRP1, is that > correct? The two main limitations of the USRP1 for me are the clock > stability (minor) and the the FPGA size (more significant). > The S3A-1400 has twice as many logic cells. An even bigger difference is that it has 32 hard multiply units, while the cyclone had to use a lot of general logic resources in order to do multiplies. So the capability is more like 3x. The B100 will have much better clock stability (~2.5ppm over temperature) even without the GPSDO. Matt
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