本帖最后由 超級狗 于 2024-9-23 12:56 编辑 ) ^0 T5 [5 [1 G7 T( v1 [$ r
' ? [' g+ E' z+ w9 _$ d" ? CPOUT ' K, B# z# S' _0 bCharge-Pump Output. Connect a PLL loop filter as a shunt C and a shunt combination of series R and C. 4 Q- k$ H' y- X9 O8 p' I: V o% n$ P( D& O 9 Q% Q4 x3 T7 `7 M4 G
踢哀（TI）E2E 論壇 0 O4 X/ A x, W6 f% pAs 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. - \5 F- e$ c; U9 S* ?$ n. w9 T ) }3 A) @0 \& [% O3 a3 Q2 s8 u6 J! O1 M
超級狗 发表于 2024-9-23 12:50 6 S" e0 ?) A% u踢哀（TI）E2E 論壇! l+ C/ P, N( s. D) n
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。2 p6 s8 l, _ W9 n: G: C8 r
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发表于 2024-9-23 12:44
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