A Digital Sweep (Chirp) Generator with Extremely Small Memory Size and High Level of the Spurious Free Dynamic Range
Several applications require coherent sweep (chirp) signals, i.e. a sweep where both the phase and frequency must be specified for all time. This paper presents an efficient technique to extremely increase the performance of Pedersen's digital chirp generator concerning the level of the Spurious-Free Dynamic Range (SFDR) and size of the memory. The proposed digital chirp generator uses the piece-wise parabolic interpolation to decrease the memory size and system complexity while maintaining excellent spectral performance in comparison with the other techniques.