学PLL求助1_Phase Locked Loops_Design Simulation and Applications

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Figure 2.2  Some typical exciting functions as applied to the reference input of a PLL. (a) Phase step a
at t = 0; θ1(t) = ΔΦ · u(t). (b) Frequency step Δω applied at t = 0; θ1(t) =Δω·t. (c) Frequenc
starting at t = 0; θ1(t) = Δω t2/2.

图a好理解点  图b和图c没看明白啊   注意   图中注释末尾那个 t2/2是 t^2/2


谢谢