closedloop - synthesizer closed loop transfert function
Compute the closed-loop transfert function of a frequency synthesizer of a second order loop of type 2, defined as :
with G(s) the transfert function of the direct gain and H(s) the transfert function of the feedback gain :
with Kv the sensitivity of the VCO in rad/v, Kcp the PFD gain in A/rad, F(s) the transfert function of the loop filter and N the value of the feedback divider.
B = closedloop(F,kv,Icp,N)
A. Layec A. Layec
- F :
polynomial defining the transfert function of the loop filter.
- kv :
real. local sensitivity of the Voltage Controlled Oscillator [Hz/V]
- Icp :
real. maximum charge pump output current [A]
- N :
integer. feedback divider value
- B :
polynomial defining the transfert function of the closed loop
U. Rhode, Digital PLL Frequency Synthesizers.Prentice Hall, 1983.