Patent ID: 7761268

Claim:
A non-linear transient analysis method for phase locked loop, and the method comprising: (a) providing a phase/frequency detector with an output signal comprising multiple pulse cycles and converting each of the pulse cycles in the form of piecewise linear format; (b) dividing each pulse cycle into two linear regions comprising a first region and a second region; (c) setting a first initial voltage value of a first linear equation by a first voltage value at the beginning of a current one of the pulse cycles, and calculating the first linear equation in the first region to obtain a second voltage value, wherein the first linear equation is defined: V mid N=VN (1−( T−W ))÷ T p where T is a pulse cycle, W is a pulse width, T p is a time constant of the loop filter, VN is a first voltage and V mid N is a second voltage; (d) setting a second initial voltage value of a second linear equation by the second voltage value, and calculating the second linear equation in the second region to obtain a third voltage value to be an initial voltage value for a next one of the pulse cycles; (e) obtaining an average voltage of the first region and the second region as an input voltage inputted to a voltage controlled oscillator to produce an output signal inputted into the phase/frequency detector; and (f) repeating the steps of (b), (c), (d) and (e) to complete a computation of phase locked loop transient response.