Phil,
The BB60D uses the same ADC as the BB60C. It’s a very good 14 bit ADC. The dynamic range improvements came from using high IP3 amplifiers and mixers, and carefully balancing gain through the entire signal chain (too much or too little gain anywhere in the signal chain and either your noise floor or linearity pay a price).
Distortion free dynamic range is 2/3 (IP3-DANL). With a -10 dBm reference level, IP3 at 1 GHz (on the most recent unit calibrated) is +15 dBm, and DANL at the same settings is -142 dBm for a 1 Hz bandwidth, so dynamic range would be about 104.7 dB at 1 GHz, normalized to a 1 Hz RBW. It would be lower at 6 GHz than 1 GHz, and obviously lower at higher RBWs as well.
We do not spec dynamic range, but we do specify worst case DANL and IP3. Hopefully this helps.
