目前,在数字频率合成器中广泛使用一种数字式电流型鉴频—鉴相器。由于它即能鉴相又能鉴频,因而采用这种鉴相器的锁相环路能实现宽频带自动捕捉,不再需要辅助捕获设备,而且大大地扩展了环路的捕捉范围和线性鉴相区域。输出波纹小、电路简单、组装调试方便是这种鉴相器的特点。 Currently, a digital current-mode discriminator-phase detector is widely used in digital frequency synthesizers. Because it can phase and phase frequency can be frequency, so the phase-locked loop using this phase detector can automatically capture wideband, no longer need auxiliary capture device, and greatly expanded the loop capture range and linearity Phase area. Output ripple is small, the circuit is simple, easy assembly and debugging is the characteristics of this phase detector.