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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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* 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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