| 摘要 |
A level shifter ( 320 ) includes a first capacitor ( 510/612/712 ), a first resistor ( 524/626/734 ), a first switch ( 526/630/728 ), and a first current source ( 528/632/730 ). The first capacitor has a first terminal for receiving an input signal, and a second terminal coupled to a first output terminal. The first resistor has a first terminal coupled to a first reference voltage terminal, and a second terminal coupled to the first output terminal. The first switch has a first current conducting electrode coupled to the second terminal of the first resistor, a control electrode for receiving a complement of the input signal, and a second current conducting electrode. The current source has a first terminal coupled to the second current conducting electrode of the first switch, and a second terminal coupled to a second reference voltage terminal. The level shifter ( 320 ) may be coupled between a phase detector ( 310 ) and a charge pump ( 330 ) of a phase locked loop ( 300 ).
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