Stereo and Color Signal Demodulation with Integrated Circuit Techniques

This paper outlines general considerations of silicon monolithic integrated circuit design. It then reviews principles of gate demodulation with special emphasis on stereo and color signal demodulations. The ideas presented are merged to form the basis for discussion of the design and development of two monolithic integrated circuits. An FM broadcast stereo demodulator is described which encompasses the functions of subcarrier regeneration as well as additional functions of inter-station mute, weak signal demodulator defeat, indicator lamp driver, and inter-stereo-station mute. A versatile monolithic color demodulator is described which is capable of either direct or difference signal color demodulation. In addition, this IC has provisions for blanking and the option of brightness/luminance control.