A five function IC for television receivers

Five circuit functions required in a television (TV) receiver - namely, the sync separator vertical take off, horizontal oscillator, automatic frequency control (AFC), automatic phase control (APC), and a noise blanking circuit - have been successfully combined in a single monolithic chip. This approach demanded a deviation from accepted discrete design principles and resulted in circuitry requiring only one half as many total components as previously used, while at the same time giving superior performance. Some features, besides the obvious space and power dissipation advantages common to IC technology, include the elimination of a feed-back winding on the fly back transformer for the APC and the elimination of the horizontal hold control. Also deemed important is the complete lack of coils or transformers for the oscillator itself. This work exdmines the individual circuits within the monolithic structure as well as the ancillary components required for functional performance.