calcul_4eme_ordre - return the zeros and the pole of a fourth order digital PLL type 2
[tau1,tau,tau2] = calcul_4eme_ordre(fn,phi,kv,icp,N,fcpf,attn)
- fn :
real. natural cut-off frequency of the open-loop transfert function [Hz]
- phi :
real. phase margin at the cut-off frequency [rad]
- kv :
real. local sensitivity of the oscillator [Hz/V]
- icp :
real. maximum charge pump output current [A]
- N :
integer. feedback divider value
- fcpf :
real. frequency update of PFD [Hz]
- attn :
real. desired attenuation at cut-off frequency of the open-loop transfert function [dB]
- tau1 :
real. zero of the transfert function of the loop filter (s)
- tau :
real. first pole of the transfert function of the loop filter (s)
- tau2 :
real. second pole of the transfert function of the loop filter (s)
- tau3 :
real. third pole of the transfert function of the loop filter (s)
A. Layec