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fbatrouni

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Created Oct 7, 2026

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Updated Oct 7, 2026

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SPICE netlist

* Clock synthesizer, the closed loop in small-signal form, N = 48
* Phases are voltages here: 1 V is 1 radian.
* Gcp: phase detector and charge pump, Icp/(2 pi) amperes per radian = 0.00045/6.283185
* Gvco with Cint: the oscillator as an integrator, 2 pi Kvco radians per second per volt = 6.283185*5.2e+07
* Ediv: the feedback divider, 1/N = 1/48
* Rdc and Rint are not on the board: they only give the simulator a path for direct current.
* Plot V(div): reference phase to divided phase, G/(1+G). Its highest point above 0 dB is the peaking.
Vref ref 0 DC 0 AC 1
Eerr err 0 ref div 1
Gcp 0 cp err 0 7.161972e-05
C1 cp 0 1.5e-09
R1 cp m 430
C2 m 0 3.3e-08
R2 cp vt 910
C3 vt 0 1.5e-10
Rdc cp 0 1e9
Gvco 0 ph vt 0 3.267256e+08
Cint ph 0 1
Rint ph 0 1e9
Ediv div 0 ph 0 0.02083333
.ac dec 200 100 1e7
.end

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