A Versatile Digital CMOS Video Delay Line with Embedded ADC, DAC and RAM

A video line compression chip is presented which can change the aspect ratio of PAL and NTSC video pictures into a multitude of formats. It has analog input and output and contains embedded AD, DA, 18Kbit SRAM, control and configuration logic. This has the advantage that switching-noise generating digital I/O's are absent. Experimental results show that spurious components are below -50dB of the applied fundamental. The chip was fabricated in a high volume 1μm full CMOS process and operates at 54 MHz maximum clockrate.