Introduction - If you have any usage issues, please Google them yourself
For frequency-locking phase-locked (Phase and the Frequency Detector PFD) conditions applied to the low signal to noise ratio, frequency offset, through theoretical analysis and simulation described the capture speed of the window type, the system frequency deviation, range, noise threshold and phase noise jitter mechanism. equivalent phase noise power spectral density expression is derived to prove the large windows with a lower noise threshold and the steady-state phase jitter, but to capture slow in order to improve the capture speed, The phase detector output value to take the polarity operator improved PFD algorithm. new algorithm not only can increase the phase gain to improve the capture speed can also reduce the equivalent noise power spectral density to reduce the phase jitter new algorithm does not require a multiplier to facilitate hardware implementation performance of the last new algorithm has been verified through simulation.