ktr
Full Member level 3
Hello all,
I am wondering whats the difference between DDS generated chirp and PLL generated chirp's phase noise characteristics in Radar Link budget analysis? It seems many papers reference DDS as a suitable option to PLL but I would have assumed digital signals having more phase noise due to clock jitter etc. when compared to a Colpitt Oscillator.
I am trying to do a RF Budget analysis to determine my receiver noise floor, DDS solutions are confusing me; in most cases a frequency multiplier is needed to get the carrier frequency up to C or X band (ISM) levels for proper operation; but should not that get away from using a Digital Generator principle?
Reference: Understanding Millimetre Wave FMCW Radars, Graham Brooker
Reference2 : Tx Leakage Cancellation of K-band Radar with Balanced Topology, Jeong-Geun Kim
Regards,
ktr
I am wondering whats the difference between DDS generated chirp and PLL generated chirp's phase noise characteristics in Radar Link budget analysis? It seems many papers reference DDS as a suitable option to PLL but I would have assumed digital signals having more phase noise due to clock jitter etc. when compared to a Colpitt Oscillator.
I am trying to do a RF Budget analysis to determine my receiver noise floor, DDS solutions are confusing me; in most cases a frequency multiplier is needed to get the carrier frequency up to C or X band (ISM) levels for proper operation; but should not that get away from using a Digital Generator principle?
Reference: Understanding Millimetre Wave FMCW Radars, Graham Brooker
Reference2 : Tx Leakage Cancellation of K-band Radar with Balanced Topology, Jeong-Geun Kim
Regards,
ktr