P-24黑白电视电路总共六块,HA系列、KC系列各三块。HA系列电路,外延之前的工艺与一般p-N结隔离的线性电路基本是一致的。KC系列电路,为了同时制作出任意集电极电位的纵向pnp管,外延之前增加了一次以B掺杂的p型埋层扩散,这就给外延工艺带来了不少麻烦。KC系列电路试制中外延所遇到的主要问题有:外延层反型、电阻率的控制、图形畸变、层错增多等等。 P-24 black and white TV circuit a total of six, HA series, KC series of three. HA series of circuits, the epitaxial process prior to the general p-N junction isolation of the linear circuit is basically the same. KC series of circuits, in order to simultaneously create any vertical collector potential pnp tube, an increase of a prior to the B-doped p-type buried layer diffusion, which gives the epitaxial process a lot of trouble. The main problems encountered in the trial production of the KC series circuits are: inversion type of the epitaxial layer, control of resistivity, pattern distortion, increase of stacking faults, and the like.