一种电荷泵锁相环、锁相环和闭环控制电路

• Format: Patent
• Language: Chinese
• Published: 22.08.2023
• Subjects: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

本申请公开了一种电荷泵锁相环，包括：第一PFD、第二PFD、PMOS管、NMOS管、第一开关电流源、第二开关电流源、低通滤波器；还包括：数字延时模块，用于分别对第一PFD和第二PFD的输出信号进行延时，得到第一延时信号和第二延时信号；第一可控开关，与PMOS管相连，用于根据第一延时信号对PMOS管的导通状态进行控制，以使PMOS管的输出电压在开启时刻前与低通滤波器的上极板电压相等；第二可控开关，与NMOS管相连，用于根据第二延时信号对NMOS管的导通状态进行控制，以使NMOS管的输出电压在开启时刻前与低通滤波器的上极板电压相等。显然，这样就能够显著降低电荷泵锁相环所需要的设计成本。 The invention discloses a charge pump phase-locked loop which comprises a first PFD, a second PFD, a PMOS transistor, an NMOS transistor, a first switching current source, a second switching current source and a low-pass filter. The charge pump phase-locked loop further comprises a digital delay module which is used for respectively delaying the output signals of the first PFD and the second PFD to obtain a first delay signal and a second delay signal; the charge pump phase-locked loop further comprises a first controllable switch which is connected with the PMOS transistor and is used for controlling the conduction state of the PMOS transistor according to the first delay signal, so that the output voltage of the PMOS