Switching Time and Spurious Reduction Techniques using PLL in Frequency Synthesizer

Frequency synthesizer is one of the critical components in both transmitter and receiver blocks. Any system which generates frequency will try to achieve good phase noise, better lock time and less spurious. This paper presents review on techniques used for fast switching time and spurious reduction in X band Synthesizer and practical issues are discussed for spur suppression. Lock time and spur are affected by a parameter called loop bandwidth, along with analog changes digital also influence switching time, look up table method is used in X band synthesizer with 200KHz of bandwidth to generate multiple spot frequencies from f1 GHz to f2GHz for the Radar application by using PLL. X band synthesizer able to achieve switching time lesser than 85μsec and spurious better than -65dBc.