本帖最后由 超級狗 于 2024-9-23 12:56 编辑 / K( N" p3 X( y' Y( \5 f" W7 I8 u' v1 s& z0 Z% J CPOUT" F) p' _! S& U7 _$ [ Charge-Pump Output. Connect a PLL loop filter as a shunt C and a shunt combination of series R and C. , m9 t7 a- j* h " Y$ V$ p9 o R. R% c' w+ o7 Z. q( {
踢哀（TI）E2E 論壇( q* D% w9 @1 Y0 g
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. 1 ~! h; ^: j6 l) R+ W% ^ % k. _7 z) y% {$ n& J/ ^0 D; f
超級狗 发表于 2024-9-23 12:50& A& L" x0 ~2 O) m
踢哀（TI）E2E 論壇8 L% @1 f! b4 p; ~& d z @4 e
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 N& w8 u. V, J& ~$ Y6 g0 u; A- k
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发表于 2024-9-23 12:44
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