本帖最后由 超級狗 于 2024-9-23 12:56 编辑 7 ~0 _1 e! t* k8 R6 G1 u
, M7 ]( D, M1 p' Z CPOUT 2 z0 \ E* |; [8 |" Q( N5 E2 sCharge-Pump Output. Connect a PLL loop filter as a shunt C and a shunt combination of series R and C.; A" t) z+ Z7 X- d8 G! N. U
踢哀（TI）E2E 論壇 4 e5 z/ {6 Y& y2 [7 J2 z% @, [As for the CPout pin, this is the charge pump output which can range from 0 to 2.5V, as it is powered by a 2.5V regulator. If this voltage falls below 0.5 V or goes above 2.0 V, then the Vtune lock detect will consider this unlocked. When the VCO is calibrated, this targes a voltage of around 1.2 volts, but this voltage can "tune" to adjust the VCO frequency.4 \1 C! a, i5 m; Z* V6 ?6 O# |
超級狗 发表于 2024-9-23 12:50 3 [$ N/ c& v- U6 z' c' o' s: U& y踢哀（TI）E2E 論壇% S: n! _7 g; K* h% U
As for the CPout pin, this is the charge pump output which can range from 0 to 2 ...
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感谢，刚看TI的资料，这应该会对相位噪声有点影响。5 k* K! k5 m8 T! ^" I
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发表于 2024-9-23 12:44
