FREQUENCY MULTIFLIER CIRCUIT

摘要

The frequency multiplier of horizontal raster signal generates a signal, synchronized to horizontal raster signal with PLL, the freq. of which is more than 3 times that of the horizontal raster signal. The output of PLL is adjusted by a flip-flop controlled by two counters. The flip-flop is set in time T1 by the first counter and is reset in time T2 by the second counter according to composite signal. The time period T1 and T2 must meet the following conditions: (I) H/2 < T1 < H (II) H < T2 < 2H where H is the period of horizontal scan and T1, T2 is mesured from the flip-flop set time.