  This paper presents a new fast switching hybrid frequency synthesizer with
wide locking range. The hybrid synthesizer is based on the tanlock loop with no
delay block (NDTL) and is capable of integer as well as fractional frequency
division. The system maintains the in-lock state following the division process
using an efficient adaptation mechanism. The fast switching and acquisition as
well as the wide locking range and the robust jitter performance of the new
hybrid NDTL synthesizer outperforms conventional time-delay tanlock loop (TDTL)
synthesizer by orders of magnitude, making it attractive for synthesis even in
Doppler environment. The performance of the hybrid synthesizer was evaluated
under various conditions and the results demonstrate that it achieves the
desired frequency division.
