Digital Parts Research And Implementation Of Frequency Synthesizer Based On ASIC

Today, as the electronic technology is developing fantastically fast, higher performance of frequency synthesizer is put forward, wide frequency range, high frequency resolution, low jump time, low phase noise, high spurious restraining and controlled by program .These requirements are too hard to reached by using normal analog circuit. Therefore, how to design a new frequency synthesizer to produce a great deal of high resolution, high stabilization frequency signal has become the key technology of synthesis.In this paper, the basic theory of frequency synthesize is introduced firstly, compare and analyze all kinds of frequency synthesize technology to know its advantage and disadvantage, PLL and DDS mostly used in frequency synthesize is introduced in detail; Because this frequency synthesizer is based on ASIC, ASIC design flow and related technology is also introduced in this paper; Then give the module division and algorithm analysis of frequency synthesizer, including analog parts; Lastly, complete design,simulation and synthesize optimization of all digital parts in modules, language used here is Verilog HDL, simulation tool is ModelSim of Mentor company, synthesize tool is Design Compiler of Synopsys, the library called is Smic18, to satisfy high frequency and low jitter, synthesize is done time and time, and all kinds of impact factor must be considered.After this frequency synthesizer is implemented, it can be used in frequency synthesize block on HDTV chip of HAJ Corp. It can also be used in digital communication devices which need frequency division and multiplication, such as demodulator, frame processor and channel decoder etc.