Title :
LFM-CW signal generator based on hybrid DDS-PLL structure
Author :
Zhao, Z.Y. ; Li, X.Y. ; Chang, W.G.
Author_Institution :
Nat. Univ. of Defense Tech., Changsha, China
Abstract :
A new method of predistortion to improve the qualities of the wideband LFM-CW signal generated by a hybrid DDS-PLL generator is introduced. The purpose of the predistortion is to reduce the phase error in the output without any increasing of the complexity. A circuit is designed and realised to generate wideband LFM-CW. With the predistortion, the maximum phase error is depressed to be less than 5°, and the PLSR of the compression with Hamming weighting is improved to be better than °37dB.
Keywords :
direct digital synthesis; phase locked loops; Hamming weighting; LFM-CW signal generator; PLSR; hybrid DDS-PLL structure; phase error; wideband LFM-CW signal;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.2852
