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5.AFC2环路及沙堡脉冲电路TDA8844行同步电路中的AFC2环路是使输入视频信号和行逆程脉冲之间具有正确相位关系所必需的,因为AFC2环路决定图像在荧光屏上的水平位置。图像的延迟和相位漂移由与束电流大小有关的行输出开关晶体管的存储时间决定。AFC2环路滤波器的时间
5.AFC2 Loop and Sandcastle Pulsing Circuit The AFC2 loop in the TDA8844 line synchronization circuit is necessary to have the correct phase relationship between the input video signal and the lineback pulse since the AFC2 loop determines the level of the image on the screen position. The image delay and phase drift are determined by the storage time of the row output switching transistor associated with the magnitude of the beam current. AFC2 loop filter time