Horizontal, Vertical and Regulator Control IC

The automatic frequency and phase control loop used for television horizontal-line synchronization is an ideal clock source for a vertical-countdown system. The frequency and phase stability of the properly applied line-derived clock results in improved interlace and eliminates the vertical-hold control. Line-synchronized signals are also presently used for the discrete generation of control signals for SCR or transistor-based power-supply regulators. Combining the horizontal, vertical, and regulator functions on a single monolithic IC takes advantage of their commonality and eliminates over 70 components in related circuits. Specifically, the deflection processor shown in Fig. 1 performs the following functions: a) generates horizontal and vertical drive signals which are phase-locked to the video-derived sync; b) generates the control signal for the receiver's voltage regulator; c) regulates the IC supply; d) controls the IC and receiver startup; e) corrects for VCR skew error; and f) preamplifies the vertical-scan signal.