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近年来,随着中、大规模集成电路的发展,单片式的色度信号处理,PAL开关和同步解调器集成电路已经广泛应用在彩色电视接收机中.集成电路TA7193P的功能包括色度放大器,ACC检波,ACC放大,色同步选通,副载波恢复、鉴相器,PAL开关,双稳态,7.8千赫识别放大,消色器(ACK)和R-Y、B-Y同步解调器,G-Y矩阵等.输出为R-Y G-Y、B-Y视频信号.此集成块内部元件390只,外接元件65只,使用的元件比用分立元件的色度板电路(一般260只左右)大为减少.功耗只有720毫瓦.现将其内部电路原理按功能分类分述于下.内部电路原理方框及外部接线见图1(a)内部电原理图见图1(b).
In recent years, with the development of large-scale integrated circuits, monolithic chroma signal processing, PAL switches and synchronous demodulator integrated circuits have been widely used in color television receivers. The functions of the integrated circuit TA7193P include chromaticity Amplifier, ACC Detector, ACC Amplifier, Color Gated, Subcarrier Recovery, Phase Detector, PAL Switch, Bistable, 7.8 kHz Identification Amplifier, Achromator (ACK) and RY, BY Synchronous Demodulator, GY Matrix, etc. The output is RY GY, BY video signal. The integrated chip internal components 390, external components 65, the use of components than the discrete components of the chrominance circuit (typically about 260) greatly reduced power consumption 720 milliwatts. Now its internal circuit principle according to the functional classification is described below. Internal circuit principle box and external wiring shown in Figure 1 (a) internal power schematic shown in Figure 1 (b).