Reply To: IQ with external trigger

Forums BB Series Discussions IQ with external trigger Reply To: IQ with external trigger

#79748
AndrewAndrew
Moderator

Hi Andrew,

The trigger values in the current API provide you with the full resolution pre-decimation. The BB60 has a sample rate of 80MS/s which we convert to a 40MS/s I/Q data stream with decimation 1. The triggers are referenced to the 80MS/s. So at a decimation of 1, you would need to divide a trigger value by 2 to have it reference a sample in a 40MS/s I/Q stream.

If you have a decimation of ‘n’, divide the trigger value by (n*2) to have it reference a sample in your data stream.

Alternatively, the trigger values range between 0 and 2^20 (1048576), so if your getting 8192 samples per acquisition, divide the trigger value by the ration of 2^20 / 8192 = 128.

The reason it is this way, is so that the triggers are still providing 12.5ns resolution for any I/Q data stream.

Regards,
A.J.