I though this might be of interest to those of you working with the TI cc1100/01 parts in the 902-928mhz ISM band. I implemented a spectrum analyzer with the RSSI output to plot the noise floor of both parts for comparison. The white line is the average signal over time and green is a single instantaneous trace. As you can see the cc1101 is better overall, but a little less linear throughout the band. The red vertical lines are 902 and 928 mhz.
I wouldn’t think the NF of that receiver was that good.
That is the noise floor of the device. This is not the same thing as the specified sensitivity for 1% packet loss. In my case, the sensitivity for reliable communication throughout the band (81khz IF filter) is about -103dBm, which corresponds with the specs in the data sheet very well.
I think the interesting thing is about these two plots is the difference in linearity across the band. Also note that there are two small spurs on the CC1100. The second spur is also in the CC1101, but doesn’t really show up in the average plot.
It is definitely a wonderful transceiver. Hard to believe they jammed all that in a little 4 x 4mm package
