Design and implementation of high switching and low phase noise frequency synthesizer

الملخص EN

-This research describes the design & implementation of frequency synthesizer using single loop Phase lock loop with the following specifications: Frequency range (1.5 – 2.75) GHz,Step size (1 MHz), Switching time 36.4 μs, & phase noise @10 kHz = -92dBc & spurious -100 dBc The development in I.C.

technology provide the simplicity in the design of frequency synthesizer because it implements the phase frequency detector(PFD) , prescalar & reference divider in single chip.

Therefore our system consists of a single chip contains (low phase noise PFD, charge pump, prescalar & reference divider), voltage controlled oscillator , loop filter & reference oscillator.

The single chip is used to provide the following properties :  Low power consumption.

 Small size, light weight.

 Flexibility in selecting crystal oscillator frequencies to fit into the system frequency planning.

 High reliability.

The application of this synthesizer in frequency hopping systems, satellite communications & radar because it has high switching speed ,low phase noise & low spurious level.