论文部分内容阅读
一是0°副载波产生电路,即APC锁相环路由TA7698AP⒀、⒁、⒂脚压控振荡器、4.43 MHz晶振和⒃、⒅脚内外APC鉴相器组成);二是90°副载波倒相识别、控制电路和消色控制电路(由(38)脚内双稳态触发电路、PAL开关和⑿脚内部倒相识别鉴相与消色电压控制输出电路组成)。 1.0°副载波产生(或称恢复)电路—APC锁相环路徒弟:何谓锁相环路,由哪些电路构成,又何作用? 师傅:所谓的锁相环路,指的是通过锁相环(相位
First, 0 ° subcarrier generation circuit, that APC PLL by TA7698AP ⒀, ⒁, ⒂ feet voltage-controlled oscillator, 4.43 MHz crystal and ⒃, ⒅ feet APC phase detector inside and outside the composition); the second is 90 ° subcarrier phase inversion Identification, control circuit and achromatic control circuit (by (38) foot bistable trigger circuit, PAL switch and pin internal phase inversion phase identification and achromatic voltage control output circuit). 1.0 ° Subcarrier generation (or recovery) circuit-APC phase-locked loop apprentice: What is the phase-locked loop, which circuit constitutes, what role? Master: The so-called phase-locked loop, (Phase