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问 请教如何将Y/C合成复合视频？ 答 1: 简单应用将Y和C接到一起就是复合视频或许还要考虑一下阻抗、电平的匹配
呵呵 答 2: 有专门用于Y、C输入复合输出的芯片 答 3: 能否推荐一款？直接连接是否会影响输出质量？ 答 4: re:xwjsure? 答 5: NJM2274The NJM2274 is a low power, 3V operation video amplifier with
Y/C mixer and 75 ohm driver , which connect TV monitor directly.
The NJM2274 has mute function , and suitable for energy save
products and any low power system , which are Digital Camera ,
DVC and other video amplifier system.

把DATASHEET上资料拷下来了,楼主参考

还有一颗: |IA274| 把视频信号Y和C混波后再放大2倍（完全直接替代JRC公司的NJM2274），该IC主要用于夜视监控摄像机和高线监控摄像机。该IC在3V或5V电压下都能工作.

IA274 datasheet [URL=http://www.tgwdz.com/pdf/IA274.doc]IA274产品说明书[/URL]