| 摘要 |
A circuit and equipment for quickly locking a microwave frequency source, comprising a sampling phase detector (PD), a loop filter (LF), a preset circuit module, a frequency divider (1/N) and a voltage-controlled oscillator (VCO), wherein the sampling phase detector (PD) is connected to one end of the loop filter (LF); the other end of the loop filter (LF) is connected to the preset circuit module; the other end of the preset circuit module is connected to the voltage-controlled oscillator (VCO); and the voltage-controlled oscillator (VCO) is connected to the sampling phase detector (PD) through the frequency divider (1/N). A change condition from a locking voltage V01 with an original F1 frequency to a tuning voltage V02 with a target frequency F2 is adjusted through preset adjustment; VT in a circuit in the process always keeps constant, such that the charging time of a capacitor is zero, the frequency hopping time is reduced, and a frequency hopping overhead brought by the charging time of the capacitor of the loop filter (LF) in the present scheme is directly solved. |
