Modular Design and Analysis of Direct Frequency Synthesizer
Dai Chuan-tang · Telecommunication Engineering · 2008
The main specification of direct frequency synthesizer is analyzed in detail,and a design method of direct frequency synthesizer modularization is introduced.P-band frequency markers are generated by using programmable divider,frequency translation and SAW switched filter banks.This proposed approach can be used in L,S,C and X-band radar frequency synthesizer.This method has low phase noise,low spurious and fast frequency agile.The experiment result shows that the phase noise is below-120dBc/Hz @1kHz,the spurious is below-65dBc and the agility time is less than 1 μs in C-band when the frequency deviates 1 kHz from carriers.The synthesizers are widely used in multi-beam radar and airborne phased array radar.