Analog system, the signal source due to the limitations of analog components, resulting in signal accuracy is not high, the temperature and time stability of the difference, the phase is difficult to control [6] [7]; PLL frequency synthesizer with high frequency accuracy, resolution rate and spectra

The signal source simulation system due to limitations of the simulator is a signal that the precision is not high, and the temperature difference between stability and time, phase is difficult to control [ 6] [ 7 ]; phase lock-frequency synthesiser with a greater frequency accuracy, resolution and

Because the simulation system supply oscillator is simulated the component the limitation, has the signal precision not to be high, the temperature and the time stability are bad, the phase controls (6)(7) with difficulty; The phase-lock type frequency synthesizer by the high frequency precision, th

Simulation system of signal sources due to limitations of the analog devices, signal accuracy is not high, temperature and time stability of difference, phase control [6][7], phase-locked frequency synthesizer at a higher frequency accuracy, resolution and spectral purity of a wide range of applicat

Imitating the signal source of the system is imitated the limitation of device, the precision of producing the signal is not high, temperature and time stability are bad, the phase place is difficult to control [6 ] [7 ]; T